NCERT Class XI Chemistry Structure of Atom Solutions

Question : 48

Total: 67

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

Solution:

Energy of photon, E =

,
Here, h = 6.626 × 10–34Js, c = 3 × 108ms–1, λ = 600 nm = 600 × 10–9m = 6 × 10–7m
∴ E =

6.626×10−34×3×108

6×10−7

= 3.31 × 10−19J
Since Total energy received = 3.15 × 10–18 J
Number of photons =

3.15×10−18

3.31×10−19

= 9.52 ≈ 10

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