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Assertion (A) : If the potential differe...

Assertion (A) : If the potential difference applied to an electron is made `4` time , the de Broglie wavelength associated is halved
Reason (R ) : On making potential difference `4` times , velocity is doubled and hence `lambda` is halved

A

If both Statement -I & Statement -II are True & the Statement -II is a correct explanation of the Statement
I.

B

If both Statement -I & Statement -II are True but the Statement -II is not a correct explanation of the
Statement- I.

C

If Statement -I is True but the Statement -II is False.

D

If Statement -I is True but the Statement -II is True .

Text Solution

Verified by Experts

The correct Answer is:
A
`lambda_(1)=sqrt(150/(V))Å`,`lambda_(2)sqrt((150)/(4V))Å`=`(1)/(2)sqrt((150)/(V))Å`=`lambda_(1)/(2)`
`(1)/(2)m_(e)u_(1)^(2)=eV" "(1)/(2)m_(e)u_(2)^(2)= 4 eV`
`rArru_(1)=sqrt((2ev)/(m_(e)))`
`lambda_(1)=(h)/("mu"_(1))" "=2mu_(1)`
`lambda_(2)=(h)/("mu"_(2))=(h)/(2"mu"_(1))=(lambda_(1))/(2)`
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