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KonstantinChe [14]
3 years ago
8

Which of the following is true about light waves and sound waves? A. Sound waves can move at different speeds, but light waves a

lways move at the same speed. B. Light waves can move at different speeds, but sound waves always move at the same speed. C. They each travel at different speeds when moving through different materials. D. Sound waves and light waves travel at the same speed through different materials.
Physics
1 answer:
vivado [14]3 years ago
3 0

Answer:

C

Explanation:

Sound waves speed up noticeably when moving through a solid or liquid, because all it is is just particles colliding; and particles are way closer together with those states of matter.

The speed of light can change when moving through different substances, but this is dependent on complicated factors such as frequency, polarization, intensity, et. cetera

The important part is that it does change speed, so your answer is C.

Hope this helps!

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Regardless of the time of year, the northern and southern hemispheres always experience opposite seasons. This is because during summer or winter, one part of the planet is more directly exposed to the rays of the Sun than the other, and this exposure alternates as the Earth revolves in its orbit.
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3 years ago
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A house brick has a volume of 1900 cm³ and a weight in air of 80N.What is its apparent weight in water?The density of water is 1
Shtirlitz [24]

Answer:

61 N

Explanation:

We'll begin by calculating the mass of the brick when placed in water. This can be obtained as follow:

Volume of brick = 1900 cm³

Density of water = 1 g/cm³

Mass of brick in water =…?

Density = mass / volume

1 = mass of brick in water / 1900

Cross multiply

Mass of brick in water = 1 × 1900

Mass of brick in water = 1900 g

Next, we shall convert 1900 g to Kg.

1000 g = 1 Kg

Therefore,

1900 g = 1900 g × 1 Kg / 1000 g

1900 g = 1.9 Kg

Next, we shall determine the weight in water. This can be obtained as follow:

Mass (m) = 1.9 Kg

Acceleration due to gravity (g) = 10 m/s²

Weight (W) =?

W = m × g

W = 1.9 × 10

W = 19 N

Thus, the weight of the brick in water is 19 N.

Finally, we shall determine the apparent weight of the brick in water. This can be obtained as follow:

Weight in air = 80 N

Weight in water = 19 N

Apparent weight =?

Apparent weight = weight in air – weight in water

Apparent weight = 80 – 19

Apparent weight = 61 N

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3 years ago
Emily’s vacuum cleaner has a power rating of 200 watts. If the vacuum cleaner does 360,000 joules of work,
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Divide 360000 by 200 to get 1800 seconds, or half of hour.
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3 years ago
Particle motion in surface waves is __________ motion.
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Surface wave is defined as the type of wave that is capable of moving at the interface between two different types of mediums/materials (example is surface wave that is between the water and air).
Particles in the surface wave usually move in orbital or elliptical shapes and their motion is a combination of both longitudinal and transverse motions.

Based on the above, the correct choice is:
<span>A) a combination of longitudinal and transverse
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3 years ago
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A piece of taffy slams into and sticks to an identical piece of taffy at rest. The momentum of the combined pieces after the col
Marina CMI [18]

Answer:

D) 50%

Explanation:

According to conservation of momentum:

m_{1} v_{1i} + m_{2} v_{2i} = m_{1} v_{1f} + m_{2} v_{2f}

Assuming that the second taffy started at rest, both pieces have the same mass and that they combined after the collision, their final velocity is:

m v_{1i} = (m+m) v_{f}\\v_{f} = 0.5 v_{1i}

The initial kinetic energy of the system is:

E_{ki} = \frac{m*v_{1i}^2}{2}

Since the second taffy was not moving, it had no kinetic energy at first.

The initial kinetic energy of the system is:

E_{kf} = \frac{2m*v_{f}^2}{2}\\E_{kf} = \frac{2m*(0.5v_{1i})^2}{2}\\E_{kf} = \frac{0.5m*v_{1i}^2}{2}

The percentage of kinetic energy that becomes heat is given by:

H=1 - \frac{E_{kf}}{E_{ki}}\\H=1 - \frac{\frac{0.5m*v_{1i}^2}{2}}{\frac{m*v_{1i}^2}{2}}\\\\H=1- 0.5 = 0.5

THerefore, 50% of the kinetic energy becomes heat

8 0
3 years ago
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