2 years ago

Which of the following types of waves can transmit only through matter? Select all that apply.

Physics

1 answer:

Ivan2 years ago

3 0

D) Gamma Rays

Explanation:

Gamma rays can transmit through matter.

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Light is incident on an air-water interface at an angle of 30 degree to the normal. What angle does the refracted ray make with

Vikentia [17]

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22 degree

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Angle of incidence, i = 30 degree

the refractive index of water with respect to air is 4/3.

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According to Snell's law,

Refractive index of water with respect to air = Sin i / Sin r

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2 years ago

An acorn falls from a tree and hits the ground in 0.8 s. How far did the acorn fall . Use g = 9.8 m/s^2. Round your final result

mylen [45]

The distance covered by the acorn is 3.136 m.

<u>Explanation:</u>

The time taken for the acorn to hit the ground is 0.8 s. As it is a free fall, the acorn will be completely under the influence of gravity. So the acceleration will be acceleration due to gravity.

Then using the second law of equation,

$s=ut+\frac{1}{2}gt^{2}$

Since the initial velocity and time is zero, then the time taken to reach the ground is stated as 0.8 s, so

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So the distance covered by the acorn is 3.136 m.

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