NEETPhysics-Wave Optics
NEET Physics Energy of Photons MCQ Question
Type: MCQ-numerical-Medium-Class 12
Calculate the energy in joule corresponding to light of wavelength 45 nₘ. (Planck's constant, h = 6.63 × 10⁻³⁴ J/s, speed of light, c = 3 × 10⁸ m s⁻¹)
A
6.67 × 10⁻¹⁵
B
6.67 × 10¹¹
C
42 × 10⁻¹⁵
D
42 × 10⁻¹⁸
Correct Answer
Option A
Detailed Explanation
Energy (E) is calculated using E = hc/λ. Substituting the given values, E = (6.63 × 10⁻³⁴ × 3 × 10⁸) / (45 × 10⁻⁹) = 6.67 × 10⁻¹⁵ J.
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