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

Question

7. Two different beams of light shine on 2 barrels filled with water. Fig. 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 th following statements is true (T) or false (F). Provide a brief reasoning for each of your answer. Figure 1: Problem 8 (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 has higher frequency. (#1) (c) The upper electromagnetic wave (#1) moves faster than the lower one (#2).

Explanation / Answer

a)The more the frequency the more the energy absorbed or transferred.Hence option A is incorrect.

b)incorrect.as shown in figure when wave1 travel 3600,wave 2 covers 6300 phase.So frequency of wave 2 is more.

c)weknow

c=wavelength*frequency

Since the wave 1 has low frequency so it will move slower than wave2.

d)True. low frequency wave emit low enegy photon so ,no of photons hitting barrel 1 are less than that hitting barrel2.

e)A high frequency wave have high energy photon, so photon of lower one2 have high energy.Hence, E is also false

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