NEET2026Physics-Electromagnetic Waves
NEET 2026 Physics Photon Emission MCQ Question
Type: MCQ-numerical-Medium-Class 12
A bulb is rated at 150 watt, converting 8% energy into light. If energy of one photon is 4.42 × 10⁻¹⁹ J, how many photons are emitted by the bulb per second?
A
2.71 × 10¹⁹
B
4.06 × 10¹⁹
C
27.2 × 10¹⁹
D
1.35 × 10¹⁹
Correct Answer
Option A
Detailed Explanation
The energy converted to light is 12 J. Using E = nhν, where E is energy, n is the number of photons, and hν is the energy of one photon, n = 12 / 4.42 × 10⁻¹⁹ = 2.715 × 10¹⁹.
Found an issue with this question?