اگر فوٹوون کی لہر کی لمبائی دوگنی ______ ہے؟
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A. Frequency is doubled
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B. Energy is doubled
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C. None of these
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D. Energy is reduced by the factor of two
Explanation
- Energy of a photon is given by , so if the wavelength () is doubled, energy () is halved.
- Frequency () and wavelength () are inversely related (), so doubling reduces by half.
فوٹوون کی توانائی ______ کے ذریعہ دی گئی ہے؟
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A. m.c²
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B. m.e
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C. None of these
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D. hf
Explanation
The energy of a photon is calculated using the formula E = hf, where:
- h = Planck’s constant
- f = frequency of the photon
This shows that photon energy is directly proportional to its frequency.
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A. None of these
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B. 4524.2×10^18/m^3
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C. 2.4961/m^3
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D. 2.4961×10^18/m^3
Explanation
Energy of one photon (E) = hc / λ
h = 6.626 × 10^-34 Js
c = 3 × 10^8 m/s
λ = 4961 Å = 4961 × 10^-10 m
E = (6.626 × 10^-34 Js × 3 × 10^8 m/s) / (4961 × 10^-10 m)
= 4.007 × 10^-19 J
Number of photons required to do 1 J of work:
n = 1 J / (4.007 × 10^-19 J)
= 2.4961 × 10^18
✅ Correct: 0 |
❌ Wrong: 0 |
📊 Total Attempted: 0
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