Two different beams of light shine on 2 barrels filled with water. Fig. 7 shows

Question

Two different beams of light shine on 2 barrels filled with water. Fig. 7 shows a snapshot of the electric field component of the electromagnetic wave in each case (the amplitude for #1 and #2 are the same). Indicate whether the following statements is true (T) or false (F). Provide a brief reasoning for each of your answer. (a) The amount of energy absorbed by barrel #2 in one minute is the same as the amount of energy absorbed by barrel #2. (b) The upper electromagnetic wave(#1) has higher frequency. (c) The upper electromagnetic wave (#1) moves faster than the lower one (#2). (d) The number of photons hitting barrel #2 in one minute is more than the number of photons hitting barrel #1. (e) A photon of the upper electromagnetic wave (#1) has a higher energy than on of the lower one (#2)

Explanation / Answer

a) True

Becausem Intebsity is propotional to E.

b) False

c = lamda*f

the upper wave has more wavelength compared to lower wave.

so, lower wave frequency must be less.

c) False

Because, all the elctromagnetic waves move with same speed.

d) False

In barrel #1, more no of photons in one minute.

e) False

because, Energy of photon, E = h*f

so, wave which has high frequency has high energy photons.

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