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Question

Question: The energy of a photon of light of wavelength 450 nm is....

The energy of a photon of light of wavelength 450 nm is.

A

4.4×10−19J4.4 \times 10^{- 19}J

B

2.5×10−19J2.5 \times 10^{- 19}J

C

1.25×10−17J1.25 \times 10^{- 17}J

D

2.5×10−17J2.5 \times 10^{- 17}J

Answer

4.4×10−19J4.4 \times 10^{- 19}J

Explanation

Solution

E=hcλ=6.62×10−34×3×108450×10−9=4.4×10−19JE = \frac{hc}{\lambda} = \frac{6.62 \times 10^{- 34} \times 3 \times 10^{8}}{450 \times 10^{- 9}} = 4.4 \times 10^{- 19}J