Question

The wave length of two photons A and B are 100 A and 100nm.the ratio of their energies will be
1)1:1 2)2:1 3)10:1 4)1:10
With explaination

Answer 1

Answer

(3) E₁ : E₂ = 10 : 1

Explanation

we know, E = hc / λ

So, E₁ = hc / λ₁ ......................... (i)

  & E₂ = hc / λ₂ ..........................(ii)

ON DIVIDING equation (i) by (ii)

∴ E₁ / E₂ = λ₂ / λ₁

             = 100 × 10⁻⁹ / 10 × 10⁻⁹             (since, 1 Â = 1 × 10 ⁻⁹ m)

             = 10 / 1

∴ E₁ : E₂ = 10 : 1

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