1.

Find the (a) maximum frequency and (b) minimum wave-length of X-rays produced by 30 kV electrons. Given, `h=6.63xx10^(-34)Js`.

Answer» Correct Answer - A
(a) : Here, `V=kV,h=6.63xx10^(-34)Js`
As `eV=hv_(max)orv_(max)=(eV)/(h)=(1.6xx10^(-19)xx3xx10^(4))/(6.63xx10^(-34))`
`=7.24xx10^(18)Hz`
As `eV=(hc)/(lamda_(min))orlamda_(min)=(hc)/(eV)=(6.63xx10^(-34)xx3xx10^(8))/(1.6xx10^(-19)xx3xx10^(4))`
`=0.041xx10^(-9)m=0.041nm`


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