Question

A radio transmitter operates at a frequency $880 \,kHz$ and a power of $10\, kW$. The number of photons emitted per second is

• A. $1.72 \times 10^{31}$
• B. $1.327 \times 10^{25}$
• C. $1.327 \times 10^{37}$
• D. $1.327 \times 10^{45}$

Answer 1

Answer: (A)

No. of photons emitted per sec,
$n=\frac{\text { Power }}{\text { Energy of photon }} $
$=\frac{P}{h v}=\frac{10000}{6.6 \times 10^{-34} \times 880 \times 10^{3}} $
$=1.72 \times 10^{31}$