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Veronika [31]
2 years ago
9

When an electromagnetic wave falls on a white, perfectly reflectingsurface, it exerts a force F on that surface. If the surfacei

s now painted a perfectly absorbing black, the force that the samewave would exert on the surface is:___________.
A) F
B) F/2
C) F/4
D) 2F
E) 4F
Physics
1 answer:
Svetlanka [38]2 years ago
4 0

Answer:

B. F/2

Explanation:

The radiation force per unit area (radiation pressure Prad) exerted by an electromagnetic wave on a perfectly absorbing body has been found by experiment to be equal to the energy density of the wave

i.e Prad = u

For a reflecting body, this force exerted per unit area has been found to be twice the energy density of the wave.

i.e Prad = 2u.

Therefore, if the force exerted on a perfectly reflective body is F, then the force exerted on a perfectly absorbing body will be F/2

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Alex17521 [72]

The sentence that best explains a possible result of climate change on Earth is : (B). Extreme heat, flooding, and drought will each increase crop yields.

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1 year ago
An object of mass 8kg is attached to massless string of length 2m and swum with a tangential velocity of 3 what is the tension o
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Answer:

36 N

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Answer:

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Hey there!

The answer would be B. The sound moves from air to water.

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