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Veronika [31]
3 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]3 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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The grandfather clock will now run slow (Option A).

<h3>What is Time Period of an oscillation?</h3>
  • The time period of an oscillation refers to the time taken by an object to complete one oscillation.
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  • \sqrt{\frac{L}{g}}, where L is the length and g is the gravitational constant, is the formula for a pendulum's period.
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Hence, the grandfather clock will now run slow (Option A).

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2 years ago
Carbon forms four ionic bonds in its compounds. t or f
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False, Carbon usually forms four covalent bonds.
8 0
3 years ago
Compare the speed of a moving golf ball with the speed of a moving bowling ball if both balls have the same amount of momentum.
Kitty [74]

Answer:

The speed of the golf ball is much greater than the speed of the bowling ball.

Explanation:

7 0
3 years ago
If you make multiple measurements of your height, you are likely to find that the results vary by nearly half an inch in either
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Answer:

Height h= 1.7 m

Explanation:

Supposing we have to find height in meter.

1 feet = 0.3048 m

1 inch = 0.0254 m

Given that:

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Therefore total height of a man in meter

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3 0
4 years ago
A marble is thrown horizontally with a speed of 7 m/s. When the marble lands, it hastraveled a horizontal displacement of 30 m.
Alex Ar [27]

Answer:

t = 4.28 s

Explanation:

The horizontal speed of a marble = 7 m/s

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We need to find the time for which the marble is in air. Let the time is t. Using the formula for speed to find it as follows :

s=\dfrac{d}{t}\\\\t=\dfrac{d}{s}\\\\t=\dfrac{30\ m}{7\ m/s}\\\\=4.28\ s

So, it will in the air for 4.28 s.

6 0
3 years ago
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