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Question: The wavelength of light in the visible region is about 390 nm for violet colour and about 760 nm for...

The wavelength of light in the visible region is about 390 nm for violet colour and about 760 nm for red colour. The energy of photon is eV at violet end is :

A

2.32

B

3.19

C

1.42

D

4.13

Answer

3.19

Explanation

Solution

: Energy of the incident photon E=hυ=hcλ.....(i)E = h\upsilon = \frac{hc}{\lambda}.....(i)

For violet lightλ=390nm\lambda = 390nm

∴\thereforeincident photon energy

E=6.63×10−34×3×108390×10−9jE = \frac{6.63 \times 10^{- 34} \times 3 \times 10^{8}}{390 \times 10^{- 9}}j

=5.1×10−19j=5.1×10−191.6×10−19eV=3.19eV= 5.1 \times 10^{- 19}j = \frac{5.1 \times 10^{- 19}}{1.6 \times 10^{- 19}}eV = 3.19eV