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Standard XII

Chemistry

Planck's Quantum Hypothesis

In astronomic...

Question

In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of 3.15 × 10^–18 J from the radiations of 600 nm, calculate the number of photons received by the detector.

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Solution

From the expression of energy of one photon (E),

Where,

λ = wavelength of radiation

h = Planck’s constant

c = velocity of radiation

Substituting the values in the given expression of E:

E

E = 3.313 × 10^–19 J

Energy of one photon = 3.313 × 10^–19 J

Number of photons received with 3.15 × 10^–18 J energy

= 9.5

≈ 10

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In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of 3.15 × 10–18 J from the radiations of 600 nm, calculate the number of photons received by the detector.

In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of 3.15 × 10^–18 J from the radiations of 600 nm, calculate the number of photons received by the detector.