Question

A 10 kW transmitter emits radio waves of wavelength 500 m. The number of photons emitted per second by the transmitter is of the order of ______.

Options

• 10³⁷

• 10³¹

• 10²⁵

• 10⁴³

Answer 1

A 10 kW transmitter emits radio waves of wavelength 500 m. The number of photons emitted per second by the transmitter is of the order of 10³¹.

Explanation:

E = `"nhc"/lambda`

(where, n = no. of photons per second)

⇒ n = `(10xx10^3xx500)/(6.6xx10^-34xx3xx10^8)` ≃ 10³¹