An fm radio transmitter broadcasts at 98.4 mhz with a power of
45 kw. how many photons does it generate per second?

6.9 × 10²⁹ photons

Explanation:

Given:

Frequency, υ = 98.4 MHz  = 98.4 × 10⁶ Hz

Power, P = 45 kW = 45000 J/sec

Now,

The total energy in time, t = 1 second

E = P × t  = 45000 J/sec × 1 s

or

Energy = 45000 J

also,

Energy of photons = hυ

Where, h is the Plank's constant

or

Energy of photons = 6.625 × 10⁻³⁴ × 98.4 × 10⁶

or

Energy of photons  = 6.519 × 10⁻²⁶ J

Now,

number of photons =

or

n =

or

n = 6.9 × 10²⁹ photons

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