First slide

Electromagnetic radiation and spectra

Question

The ratio of the energy of a photon of 2000 $Å$ wavelength radiation to that of 4000 $Å$ radiation is

Moderate

A

$¼$
B

$4$
C

$½$
D

2

Solution

$E = hv = h \frac{c}{λ} i . e . E \propto \frac{1}{λ} \frac{E_{1}}{E_{2}} = \frac{λ_{2}}{λ_{1}} = \frac{4000}{2000} = 2$
Hence, the correct answer is (D).

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