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lions [1.4K]
3 years ago
13

A beam of light falling on a metal surface is causing electrons to be ejected from the surface. If we now double the frequency o

f the light, which of the following statements are correct?
A. The kinetic energy of the ejected electrons doubles
B. Twice as many photons hit the metal surface as before
C. The speed of the ejected electrons doubles
D. The number of electrons ejected per second doubles
E. None of the above things occur
Physics
1 answer:
erik [133]3 years ago
7 0

Answer:

b

Explanation:

you doubled the frequency, and the others would be affected by energy distribution and surface area or area of effect.

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El sistema energético que importancia tiene en el cuerpo
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Heat Q flows spontaneously from a reservoir at 404 K into a reservoir at 298 K. Because of the spontaneous flow, 2740 J of energ
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The heat is 10458 J and 15480 J.

Explanation:

Given that,

Temperature T₁ = 404 K

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Work done = 2740 J

If the temperature T₁ =298 k

Temperature T₂ = 245 K

We need to calculate the heat

Using efficiency formula

\eta=\dfrac{W}{Q}...(I)

We need to calculate the efficiency

Using formula of efficiency

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Put the value of efficiency in equation (I)

0.262=\dfrac{2740}{Q}

Q=\dfrac{2740}{0.262}

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Again, we need to calculate the efficiency

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Using equation (I)

Q=\dfrac{2740}{0.177}

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Hence, The heat is 10458 J and 15480 J.

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3 years ago
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