Target Exam

CUET

Subject

Physics

Chapter

Dual Nature of Radiation and Matter

Question:

The momentum of photon of electromagnetic radiation is $3.3 \times 10^{-29} Kg ~ms^{-1}$. The frequency of the waves associated with it would be - (use $h=6.6 \times 10^{-34} Js$)

Options:

$1.5 \times 10^{13} Hz$

$15 \times 10^{13} Hz$

$1.3 \times 10^{15} Hz$

$13 \times 10^{15} Hz$

Correct Answer:

$1.5 \times 10^{13} Hz$

Explanation:

The correct answer is Option (1) → $1.5 \times 10^{13} Hz$

E, Energy of photon = hv [v = frequency]

E, Energy of photon = pc [p = photon momentum = $3.3×10^{-29}m/s$]

$hv=pc$

$v=\frac{3.3×10^{-29}×2×10^8}{6.6×10^{-34}}$

$v=1.5×10^{13}Hz$