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  4. The photons in a radio wave of wavelength 3× 104cm have energy

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

Haryana PMTHaryana PMT 2009Dual Nature of Radiation and Matter

Solution:

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