1.

If kinetic energy of emitted electron is made double then its de-Broglie wavelength will become……times initial de-Broglie wavelength.

Answer»

`sqrt(2)`
2
`(1)/(sqrt(2))`
`(1)/(2)`

Solution :de-Broglie wavelength `LAMBDA=(h)/(p)`
but `p^(2)=sqrt(2mK)`
`therefore lambda =(h)/(sqrt(2mK))`
`therefore lambda prop (1)/(sqrt(K))`[`because(h)/(sqrt(2m))` same ]
`therefore (lambda_(2))/(lambda_(1))=sqrt((K_(1))/(K_(2)))`
`therefore (lambda_(2))/(lambda_(1))=sqrt((K)/(2K)) therefore (lambda_(2))/(lambda_(1))=(1)/(sqrt(2))`


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