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The speed of an electron having a wavele...

The speed of an electron having a wavelength of `10^(-10)` m is

A

`7.25 xx 10^(6) ms^(-1)`

B

`6.26 xx 10^(6) ms^(-1)`

C

`5.25 xx 10^(6) ms^(-1)`

D

`4.24 xx 10^(6) ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
As `lambda = (h)/(mv)`
`therefore v = (h)/(m lambda) = (6.6 xx 10^(-34))/(9.1 xx 10^(-31) xx 10^(-10)) = 7.25 xx 10^(6) ms^(-1)`
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FULL MARKS-DUAL NATURE OF RADIATION AND MATTER-ADDITIONAL QUESTIONS -(MULTIPLE CHOICE QUESTIONS )
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  13. The wavelength of photon is proportional to (where upsilon = fequency)

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  14. What is the energy of a photon whose wavelength is 6840 Å ?

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