Question

The photons in a radio wave of wavelength $3\times 10^{4}cm$ have energy

• A. $6.62\times 10^{-10}J$
• B. $19.86\times 10^{-24}J$
• C. $6.62\times 10^{-28}J$
• D. $2.2\times 10^{-35}J$

Answer 1

Answer: (C)

Energy of photon,
$E=\frac{hc}{\lambda }=\frac{6.6\times 10^{-34}\times 3\times 10^8}{3\times 10^2}$
$=6.6\times 10^{-28}J$