A nocturnal bird's eye can to detect monochromatic light of frequency 6.38 * 10¹⁴ Hz with a power as small as 2.1 * 10^-17 W.What is the corresponding number of photons per second a nocturnal bird's eye can detect? A)30 B)40 C)50 D)60 E)70

Question

Quizplus · Accepted Answer

To calculate the number of photons, we can use the formula:
Number of photons = Power of radiation / Energy of each photon
Energy of each photon = Planck's constant * frequency
So, Energy of each photon = 6.626 x 10^-34 J.s * 6.38 x 10^14 Hz = 4.234 x 10^-19 J
Number of photons = 2.1 x 10^-17 W / 4.234 x 10^-19 J = 49.58 ≈ 50 photons/sec
Therefore, the corresponding number of photons per second a nocturnal bird's eye can detect is 50. The best choice is C.

A Nocturnal Bird's Eye Can to Detect Monochromatic Light of Frequency