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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 in eV at the red end of the visible spectrum is :

A

6.63

B

3.62

C

7.61

D

1.64

Answer

1.64

Explanation

Solution

: for red light λ=760 nm\lambda = 760 \mathrm {~nm}

From (i)

E=6.63×10−34×3×108760×10−9jE = \frac { 6.63 \times 10 ^ { - 34 } \times 3 \times 10 ^ { 8 } } { 760 \times 10 ^ { - 9 } } j