Dual Nature Of Matter Question 10
Question 10 - 31 January - Shift 1
If a source of electromagnetic radiation having power $15 kW$ produces $10^{16}$ photons per second, the radiation belongs to a part of spectrum is.
(Take Planck constant $h=6 \times 10^{-34} Js$ )
(1) Micro waves
(2) Ultraviolet rays
(3) Gamma rays
(4) Radio waves
Show Answer
Answer: (3)
Solution:
Formula: Energy
Energy of one photon $=\frac{\text{ Power }}{\text{ Photon frequency }}$
$E=h \nu=\frac{15 \times 10^{3}}{10^{16} m}$
$v=\frac{15 \times 10^{-13}}{6 \times 10^{-34}}=2.5 \times 10^{21}$
So gamma Rays. Option 3
