Question

How many photons of frequency 10^14 hz will make up 19.86j of energy?

Answer 1

The number of photons is 3 x 10²⁰.

Explanation:

We know

Energy of one photon = hv

Where h is Plank's constant and v is the frequency of incident radiation.

Given:

h = 6.62 × 10⁻³⁴ Js

v = 10¹⁴ Hz

So, Energy of one photon = 6.62 × 10⁻³⁴ × 10¹⁴

Energy of one photon = 6.62 × 10⁻²⁰ J

now use formula,

Number of photons = Given energy/ energy of one photon

given energy = 19.86 J

Thus

Number of photons = 19.86 J/6.62 × 10⁻²⁰

Number of photons = 3 x 10²⁰

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