How many photons of light with frequency 5.50 × 10¹⁵ Hz are required to provide 1 kJ of energy?

Question

Quizplus · Accepted Answer

We can use the formula E=hf, where E is energy in Joules, h is Planck's constant, and f is frequency in Hz. Rearranging this formula to solve for the number of photons, we get:

number of photons = E/(hf)

Plugging in the values given, we get:

number of photons = (1000 J)/(6.626 x 10^-34 J s x 5.50 x 10^14 Hz) = 2.74 x 10^20 photons

So the answer is choice B.

How Many Photons of Light with Frequency 5