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Question

What is the wavelength of a photon that has energy of 5.25 x 10-19J?


A

4.21 x 10-24

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B

2.8 x 1023

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C

2.64 x 106

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D

3.79 x 10-7

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Solution

The correct option is D

3.79 x 10-7


The wavelength and energy are related by the formula ΔE = hc/λ,

Where h is Planck's constant (= 6.626 x 10-34 Js), c is the speed of light (3.00 x 108 m/s) and λ is the wavelength in meters.

The wavelength can then be calculated by rearranging the above formula as follows:


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