Question
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 ?
NEET
Chemistry
Structure of Atom
2026
NEET 2026 (Cancelled)
NEET Chemistry Question (2026) — Solution
Options
- A. 2.71 10^ 19
- B. 3.06 10^ 19
- C. 27.2 10^ 19
- D. 1.35 10^ 19
Answer
A. 2.71 10^ 19
Step-by-step solution
Power of the bulb, P = 150 W Energy converted into light per second, E = 8\% of 150 J E = 8 100 150 = 12 J Energy of one photon, E_p = 4.42 10^ -19 J Number of photons emitted per second, n = E E_p n = 12 4.42 10^ -19 n = 2.71 10^ 19 Answer: 2.71 10^ 19
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