NEET 2026 — Chemistry solution

NEET2026Chemistry

A bulb is rated at 150 watt, converting 8% energy into light. If energy of one photon is $4.42 \times 1 0^{- 19}$ J, how many photons are emitted by the bulb per second ?

A
$27.2 \times 1 0^{19}$
B
$4.06 \times 1 0^{19}$
C
$1.35 \times 1 0^{19}$
D
$2.71 \times 1 0^{19}$

Solution

Energy emitted as light per second $= 150 \times \frac{8}{100} = 12$ J/s.

Number of photons per second $= \frac{12}{4.42 \times 1 0 ^{- 19}} \approx 2.71 \times 1 0^{19}$ .

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