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MHT CET 202622 AprilEvening Shift
Exam
MHT CET
Year
2026
Date
22 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Structure of Atom

MHT CET 2026 · 22 April · Evening Shift · Chemistry · Structure of Atom

Visible light has a wavelength of 700 nm. Calculate its frequency...

Visible light has a wavelength of 700700 nm. Calculate its frequency in hertz.

Options

  1. A7.451×10147.451 \times 10^{14} Hz
  2. B3.502×10143.502 \times 10^{14} Hz
  3. C4.286×10144.286 \times 10^{14} Hz
  4. D4.882×10144.882 \times 10^{14} Hz

Correct answer

C. 4.286×10144.286 \times 10^{14} Hz

Step-by-step solution

Given wavelength λ=700 nm=700×10−9 m\lambda = 700 \text{ nm} = 700 \times 10^{-9} \text{ m}.

Speed of light c=3×108 m/sc = 3 \times 10^8 \text{ m/s}.

Using the relation c=νλc = \nu \lambda, the frequency ν\nu is given by:

ν=cλ\nu = \dfrac{c}{\lambda}

ν=3×108700×10−9\nu = \dfrac{3 \times 10^8}{700 \times 10^{-9}}

ν=37×1015\nu = \dfrac{3}{7} \times 10^{15}

ν=4.286×1014 Hz\nu = 4.286 \times 10^{14} \text{ Hz}

Answer: 4.286×10144.286 \times 10^{14} Hz
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