Question 6 of 10

Which two characteristics make electromagnetic waves effective in

communication?

O A. They carry more energy than visible light.

B. They do not require a medium to carry information.

C. They carry information very quickly.

D. They move faster through matter than through space.

Answer:

because sound needs medium to transmit.

The sound is produced by vibration and if there is no medium there is no vibration and no vibration means no sound.

Answer:

Correct answer choice is :

B) Maximum displacement of the wave from the equilibrium position

Explanation:

The amplitude, a, of a wave is the distance from the center line to the top of a crest or to the base of a channel. Amplitude is the variation or displacement of a wave from its mean value. With sound waves, it is the amount to which air particles are removed, and this amplitude of sound or sound amplitude is encountered as the loudness of sound. The quantity of energy taken by a wave is similar to the amplitude of the wave. A large energy wave is described by a high amplitude, a low energy wave is described by a low amplitude.

Explanation:

Metamorphosis refers to the process of development and change in the body form of certain animals as they grow from juveniles to adults.

Explain the types of metamorphosis?

Metamorphosis is classified into two types: complete and incomplete.

1. Complete metamorphosis:

Complete metamorphosis is a developmental process in which the juvenile form of an animal goes through four distinct stages: egg, larva, pupa, and adult. In this type of metamorphosis, the juvenile form looks completely different from the adult form in terms of appearance, behavior, and habitat.

Animals that undergo complete metamorphosis include:

a) Butterflies and moths: The egg hatches into a caterpillar (larva) that feeds and grows rapidly. The larva then forms a pupa or chrysalis, where the body undergoes a complete transformation into an adult butterfly or moth.

b) Flies: The egg hatches into a worm-like maggot (larva) that feeds and grows. The maggot then transforms into a pupa, and finally, an adult fly emerges.

c) Beetles: The egg hatches into a grub (larva) that feeds and grows. The grub then transforms into a pupa, and finally, an adult beetle emerges.

Incomplete metamorphosis:

Incomplete metamorphosis is a developmental process in which the juvenile form (nymph) of an animal resembles the adult in appearance and habitat, but is smaller and lacks wings. The nymph goes through several stages of growth and molting before reaching adult form.

Animals that undergo incomplete metamorphosis include:

a) Grasshoppers: The egg hatches into a nymph that resembles the adult grasshopper but lacks wings. The nymph goes through several molts and growth stages before developing wings and reaching the adult stage.

b) Cockroaches: The egg hatches into a nymph that resembles the adult cockroach but lacks wings. The nymph goes through several molts and growth stages before developing wings and reaching the adult stage.

c) Dragonflies: The egg hatches into a nymph that lives in water and resembles the adult dragonfly but lacks wings. The nymph goes through several molts and growth stages before developing wings and emerging from the water as an adult dragonfly.

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The Wien's Law states that hotter objects emit more radiation at shorter wavelengths than cooler objects, with a peak emission wavelength determined by the temperature of the object.

However, hot emission nebulae appear somewhat red, and cool reflection nebulae are blue. The reason for this difference in colors is because these nebulae are not black bodies and do not emit radiation at a single wavelength, unlike black bodies.

Black bodies are idealized objects that absorb all radiation that falls on them, and emit radiation at a single wavelength, which is determined by the object's temperature. Emission nebulae are glowing gases, which emit radiation at many different wavelengths. The gas in these nebulae is heated by the radiation from nearby stars, causing it to glow and emit radiation at a range of wavelengths.

The temperature of the gas determines the overall color of the nebula. Cool gas appears blue because it emits more radiation at shorter wavelengths, while hotter gas appears red because it emits more radiation at longer wavelengths. Reflection nebulae, on the other hand, are not heated by nearby stars and do not glow.

Instead, they reflect the light from nearby stars, which can have a range of colors. These nebulae appear blue because the short-wavelength blue light is more efficiently scattered by the dust particles in the nebula than longer-wavelength red light.

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Answer:

2.5m/s²

Explanation:

Given the following:

Initial velocity u = 0m/s

Final velocity v = 20m/s

Time t = 4s

Required

average acceleration over this time in time interval​

Using the equation of motion

v = u + at

10 = 0 + a(4)

10 = 4a

a = 10/4

a = 2.5m/s²

Hence its average acceleration over this time in time interval​ is 2.5m/s²

Kim's policy remained in force for a certain number of days even though she forgot to pay the premium. the provision that allows this is called grace period provision

If the policyowner fails to make the premium payments due to some issue or reason, the insurance company will not immediately cancel the policy , whereas the company will wait for few days if no action seen than only they will take action on that account .

The grace period provision allots a specifically designated amount of time in which the policyowner has to make the required premium payments after the stipulated due date.

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The height of the image is approximately 1.066 cm, and since it is negative, it means that the image is inverted and smaller than the object.

Using the thin lens equation:

1/f = 1/d_o + 1/d_i

where f is the focal length of the lens, d_o is the object distance, and d_i is the image distance.

Plugging in the given values, we get:

1/4 = 1/16 + 1/d_i

Solving for d_i, we get:

d_i = 3.2 cm

Using the magnification equation:

m = -d_i/d_o

where m is the magnification of the image.

Plugging in the given values, we get:

m = -3.2/16 = -0.2

Since the magnification is negative, the image is inverted.

Finally, using the equation:

m = h_i/h_o

where h_i is the height of the image, and h_o is the height of the object.

Plugging in the given values and solving for h_i, we get:

h_i = m * h_o = (-0.2) * 5.33 cm = -1.066 cm

Therefore, the height of the image is approximately 1.066 cm, and since it is negative, it means that the image is inverted and smaller than the object.

What is magnification of lens?

The magnification of a lens is a measure of how much larger or smaller an image appears relative to the object that is being viewed through the lens. It is the ratio of the height of the image formed by the lens to the height of the object.

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Answer:

When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.

Explanation:

The H-R diagram, also known as the Hertzsprung-Russell diagram is a graph that demonstrates the relationship between luminosity, temperature, classification, and spectral types of stars. This diagram shows the life cycle of stars. The life cycle of stars begins with their formation, followed by a sequence of changes leading to the death of a star. The location of a star on an H-R diagram enables us to determine the mass, temperature, and luminosity of the star.

The following can be determined from the location of a main-sequence star on the H-R diagram- The position of a star on the H-R diagram is determined by the star's mass. More massive stars are placed to the left of the diagram, while less massive stars are placed on the right. Temperature can be calculated by looking at where the star falls on the horizontal axis of the H-R diagram. The temperature ranges from cool to hot, left to right. By studying the location of the star on the vertical axis, we can determine its luminosity. The luminosity ranges from dim to bright, from bottom to top.

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The following statement “Adams and Leverrier predicted the position of Neptune, based on its perturbation analysis of uranus.” is True.

Adams and Leverrier independently predicted the position of Neptune based on their observations of the perturbations in the orbit of Uranus. In the mid-19th century, astronomers noticed that Uranus was not moving exactly as predicted by Newtonian mechanics, suggesting the presence of an unknown celestial body influencing its orbit.

Using mathematical calculations and perturbation analysis, John Couch Adams (an English mathematician) and Urbain Le Verrier (a French mathematician) separately predicted the existence and approximate position of Neptune. Their predictions led to the actual discovery of Neptune in 1846.

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The magnetic field at a point near the center of the solenoid can be calculated using the formula B = μ₀ * n * I, where μ₀ is the permeability of free space, n is the number of turns per unit length, and I is the current in the windings.

First, we need to find the number of turns per unit length, which can be calculated by dividing the total number of turns by the length of the solenoid.
n = 600 / 15.00 cm = 40 turns/cm
Next, we need to convert the radius of the solenoid from centimeters to meters, as the unit for permeability is in Tesla meters per ampere (Tm/A).
r = 2.50 cm = 0.025 m
Now we can plug in the values into the formula: B = μ₀ * n * I
B = (4π * 10^-7 Tm/A) * 40 turns/cm * 8.00 A
B = 0.0402 T
Therefore, the magnetic field at a point near the center of the solenoid is 0.0402 T, which corresponds to option D in the given choices.

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The density of the given cube is 0.0007024 g/mm³.

The density of a cube can be calculated by dividing the mass of the cube by its volume, which is the side cubed. Density=mass/volume

So, the density of the given cube can be determined as:

Density = 8.74g / (10.7 mm)³

Density = 8.74g / (10.7 mm × 10.7 mm × 10.7 mm)

Density = 8.74g / 12451.57 mm³

Density = 0.0007024 g/mm³

Therefore, the density of the given cube is 0.0007024 g/mm³.

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Complete Question

Complete Question is attached below

Answer:

a)Option B

b)Option B

Explanation:

a)

Without any confirmation it will be utterly wrong to conclude that high power voltage is the reason for the elevated cancer cases

Therefore

Option B

b)

The High Concentration of cells volume in a part of the Body is what causes Cancer

Therefore

Option B

The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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You are approximately 1170.96 meters away from the location of the firework.

We know that the time difference between seeing the light and hearing the sound is 3.50 seconds. The speed of sound in air depends on the temperature, so we need to use the temperature information to calculate the speed of sound. The formula for the speed of sound in air at a given temperature is:

v = 331.3 + 0.606T

where v is the speed of sound in meters per second, and T is the temperature in degrees Celsius.

Substituting T = 5.00 degrees Celsius, we get:

v = 331.3 + 0.606 × 5.00

v = 334.56 m/s

Now we can calculate the distance to the firework using the formula:

d = v × t

where d is the distance, v is the speed of sound, and t is the time difference between seeing the light and hearing the sound.

Substituting v = 334.56 m/s and t = 3.50 s, we get:

d = 334.56 × 3.50

d = 1170.96 m

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Answer:

We can find out a direction by freely suspending a bar magnet. We will find that freely suspended bar magnet always comes to reset in a North- South direction.

Explanation:

(a) The boat moves towards the shore it is facing with a distance of 0 m.

(b) If the lovers both walk towards each other and meet at the center of the boat, the boat moves in the opposite direction with a distance of 2.58 m. The lovers meet at a distance of 1.29 m from the initial position of Juliet in the front of the boat. The direction of the boat's motion is opposite to the initial direction of Romeo's guitar.

We can solve this problem using the principle of conservation of momentum, which states that the total momentum of a system remains constant if no external forces act on it.

(a) When Juliet moves to the rear of the boat, she applies a force on the boat in the forward direction. This force causes the boat to move in the opposite direction, i.e., towards the shore. The boat and the lovers are initially at rest, so the initial momentum of the system is zero. After Juliet moves to the rear of the boat, the momentum of the system is given by

m1v1 + m2v2

where m1 and v1 are the mass and velocity of Romeo and his guitar, and m2 and v2 are the mass and velocity of Juliet and the boat after she moves to the rear.

Since there are no external forces acting on the system, the total momentum of the system must remain zero. Therefore,

m1v1 + m2v2 = 0

We can solve for v2

v2 = - m1/m2 × v1

where "-" sign indicates the direction of the velocity is opposite to that of Romeo's guitar.

Plugging in the given values, we get

v2 = - (81.0 kg)/(81.0 kg + 47.0 kg) × 0 m/s = - 0 m/s

This means that the boat and Juliet do not move in the direction of Romeo's guitar. Instead, they move in the opposite direction with a velocity of 0 m/s. Therefore, the boat moves towards the shore it is facing with a distance of 0 m.

(b) If the lovers both walk towards each other and meet at the center of the boat, their total momentum is still zero since there are no external forces acting on the system. Therefore,

m1v1 + m2v2 = 0

where m1 and v1 are the mass and velocity of Romeo and his guitar, and m2 and v2 are the mass and velocity of Juliet and the boat after they meet at the center.

Let's assume that they meet at a distance x from the initial position of Juliet in the front of the boat. Then, the velocity of Romeo and his guitar is

v1 = - x/t

where t is the time taken by them to meet at the center of the boat.

The velocity of Juliet and the boat is

v2 = x/t

Substituting these values in the conservation of momentum equation, we get

m1×(-x/t) + m2×(x/t) = 0

Solving for x, we get

x = m2/(m1 + m2) × d

where d is the initial distance between Romeo and Juliet, i.e., 2.70 m.

Substituting the given values, we get

x = (47.0 kg)/(81.0 kg + 47.0 kg) × 2.70 m = 1.29 m

The boat moves in the opposite direction with a distance of 2x, i.e., 2.58 m. The direction of the boat's motion is opposite to the initial direction of Romeo's guitar.

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Answer: nun

Explanation:

Answer:

1st

Explanation:

It is because the horse is heavier

The maximum height of the coin is 5.1 meters.

We are given that a coin is tossed directly upward into the air with an initial velocity of 10m/s. The initial velocity of the coin is given by u = 10 m/s, and the final velocity of the coin is given by v = 0 m/s (as the coin reaches the maximum height, its velocity becomes zero). The acceleration of the coin is given by a = -9.8 m/s² (as the coin is moving in the upward direction against the gravitational force).

Let's use the following kinematic equation of motion to find the maximum height of the coin:

v² - u² = 2as

The equation can be written as follows:

v = final velocity (0)m/s, u = initial velocity (10)m/s, a = acceleration due to gravity (-9.8)m/s², s = maximum height of the coin

Plugging in the given values in the above equation, we get:

0² - (10 m/s)² = 2(-9.8 m/s²)s

Simplifying the equation, we get:

s = (10 m/s)² / (2 x 9.8 m/s²)

Hence, the maximum height of the coin is:

s = 5.1 meters (approximately)

Therefore, the maximum height of the coin is 5.1 meters.

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Here, we are required to determine how the total reaction energy is calculated.

Total reaction energy =

The total reaction energy, otherwise known as the Enthalpy of the reaction is given by the difference between the enthalpy of the product and that of the reactants.

Also, it is important to note that the enthalpy is the sum total of the internal energy and the work energy of the entity in discuss, which may either be the reactants or the products.

Ultimately,

Total reaction energy =

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Answer:

B. reactant bond energy – product bond energy

Explanation:

Answer:

THANK YOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU

Explanation:

I REALLY NEED THIS

Answer:

Oh my gosh yayyy one of the asnwers got deleted!!!! Yay thx for the points

Explanation:

The type of objects occur in the halo of our Milky Way galaxy are Globular clusters. Correct option is C.

Globular groups, sub-dwarf stars, and RR Lyrae stars with little metal are all found in the stellar halo of the Milky Way. The majority of the stars in our stellar halo are older (more than 12 billion years old) and less metallic than disc stars, but some halo star groups have metal contents that are comparable to disc stars.

Very few, dispersed stars and globular groups reside in the halo. In spiral galaxies, dark matter also resides in the fringe.

The visible part of what is more generally referred to as the galactic halo is the stellar corona of the Milky Way. Dark matter dominates this galactic halo, and the gravity it produces is the only way to detect its existence. Each galaxy has a unique dark matter ring. And the correct option is C.

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Answer:

5.15 when the angle of incidence is equal to critical angle the angle of reflection is equal to 90 if the angle of incidence is bigger than the critical anger the reflected ray will not emerge from the medium but will be reflected back into the medium this is called total internet reflection

Explanation:

hope it's helpful

The displacement covered by the particle in the given time is 50 meter.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Initial velocity of the particle: u = 10 m/s.

Final velocity of the particle: v = 15 m/s.

Time interval: t = 4 second.

Hence, the average velocity of the particle = (10+15)2 m/s = 12.5 m/s.

The displacement covered by the particle in the given time:

s = average velocity × time interval

=  12.5 m/s × 4 second.

= 50 meter.

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The Schrödinger equation plays a crucial role in understanding the dual nature of electrons and the probabilistic description of their locations.

The Schrödinger equation is a fundamental equation in quantum mechanics that describes the behavior of particles, like electrons, at the quantum level. It is essential in understanding two key concepts:

The electron has both particle and wave behavior, represented by wave functions, ψ: This statement is correct. The Schrödinger equation incorporates the dual nature of electrons, treating them as both particles and waves. The wave function (ψ) is a mathematical representation of the electron's wave-like behavior, which contains information about the electron's position and momentum.

The location of an electron must be described statistically instead of absolutely: This statement is also correct. The Schrödinger equation implies that we cannot know the exact position of an electron; instead, we can only describe its probable location using a statistical approach. The square of the wave function (|ψ|^2) gives the probability density of finding an electron in a particular region of space.

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Answer:Stronger they are

(I think...)