AP EAMCET · PHYSICS · Dual Nature of Matter
A blue lamp emits light of mean wavelength \(4500 Å\). The lamp is rated at 150 W and \(8 \%\) efficiency. Then the number of photons are emitted by the lamp per second
- A \(27.17 \times 10^{18}\)
- B \(17.17 \times 10^{18}\)
- C \(27.17 \times 10^{15}\)
- D \(54 \times 10^{16}\)
Answer & Solution
Correct Answer
(A) \(27.17 \times 10^{18}\)
Step-by-step Solution
Detailed explanation
\(\lambda=4500 \mathrm{~A}^{\circ}, \mathrm{P}=150 \mathrm{~W}, \eta=8 \%\) Efficiency of the lamp, \(\eta=\frac{\text { Energy of photon }}{\text { Rated energy of lamp }}=\frac{\left(\frac{\mathrm{nhc}}{\lambda}\right)}{\mathrm{p} . \mathrm{t}}\) \(\therefore \quad\) Number of…
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