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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in
converting electrical energy to light, the number of photons of yellow light it emits per second is
  • a)
    62 × 1020
  • b)
    3 × 1019
  • c)
    1.5 × 1020
  • d)
    6 × 1018
Correct answer is option 'C'. Can you explain this answer?
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm....
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm....
To find the energy of a single photon, we can use the equation:

E = hc/λ

Where:
E = energy of a single photon (in joules)
h = Planck's constant (6.626 x 10^-34 J·s)
c = speed of light (3 x 10^8 m/s)
λ = wavelength of light (in meters)

Converting 0.6 nanometers to meters:
0.6 nm = 0.6 x 10^-9 m

Plugging in the values into the equation:

E = (6.626 x 10^-34 J·s)(3 x 10^8 m/s) / (0.6 x 10^-9 m)
E = 3.313 x 10^-19 J

Therefore, the energy of a single photon emitted by the sodium street lamp is approximately 3.313 x 10^-19 joules.
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient inconverting electrical energy to light, the number of photons of yellow light it emits per second isa)62 × 1020b)3 × 1019c)1.5 × 1020d)6 × 1018Correct answer is option 'C'. Can you explain this answer?
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient inconverting electrical energy to light, the number of photons of yellow light it emits per second isa)62 × 1020b)3 × 1019c)1.5 × 1020d)6 × 1018Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient inconverting electrical energy to light, the number of photons of yellow light it emits per second isa)62 × 1020b)3 × 1019c)1.5 × 1020d)6 × 1018Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient inconverting electrical energy to light, the number of photons of yellow light it emits per second isa)62 × 1020b)3 × 1019c)1.5 × 1020d)6 × 1018Correct answer is option 'C'. Can you explain this answer?.
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