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Energy 4000 h u of radiation of frequency u contains ______ photons.

Asked in GSEB Board July 2022 · Counting photons

Answer: (4) 4000

Step-by-step solution

Given: total energy E = 4000 h u of radiation of frequency u.

Idea: radiation of frequency u comes in quanta (photons), each of energy h u.

Number of photons N = E/(h u) = (4000 h u)/(h u)

N = 4000

So the energy is carried by 4000 photons.

Why the other options are wrong

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