Q 1511601529.     X-rays of wavelength `0.140 nm` are scattered from a block of carbon. What will be the wave lengths of X-rays scattered at `90°` ?

BITSAT 2008
A

`0.140` `nm`

B

`0.142` `nm`

C

`0.242` `nm`

D

`0.152` `nm`

HINT

`lambda’ = lambda + h/(m_e c)`

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