If h is Planck’s constant, the mom

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Target Exam

CUET

Subject

Physics

Chapter

Dual Nature of Radiation and Matter

Question:

If h is Planck’s constant, the momentum of a photon of wavelength 0.01 Å is:

Options:

$10^{-2}h$

$10^{2}h$

$10^{12}h$

Correct Answer:

$10^{12}h$

Explanation:

Momentum of photo, $p=\frac{E}{c}=\frac{hv}{c}$

Where E is the energy of a photon and c is the velocity of light.

$∴p=\frac{hc}{cλ}$ $[∵v=\frac{c}{λ}]$

$=\frac{h}{λ}=\frac{h}{0.01×10^{-10}}=10^{12}h$