Grade 12Modern Physics

A hydrogen atom moving with a speed 'v' absorbs a photon of wavelength 127nm and stops.Then the value of 'v' is nearly...........

Pls explain.......

vishwajit pureti

15 Years agoGrade 12

2 Answers

aman gupta

Approved Tutor Answer15 Years ago

energy of a photon is = hc/λ

visible light lies in 390-750 nm

maximum energy for 390 nm

h=6.626 x 10^-34

c= 3 x 10⁸

λ=390 x 10^-9

E=5.09 x 10^-19Joules

Geoffrey Richards

15 Years ago

The ans comes out to be v=3.1 m/s

Use the formula lambda = h/mv

lambda = 127nm

h = 6.626*10^-34 Js

mass (m)= 1.67*10^-27kg

Now evaluate do it as a practice ...

U get v =3.1 m/s

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A hydrogen atom moving with a speed 'v' absorbs a photon of wavelength 127nm and stops.Then the value of 'v' is nearly........... Pls explain.......

vishwajit pureti

2 Answers

aman gupta

Geoffrey Richards

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