1.

The intensity of X-rays from a coolidge tube is plotted against wavelength lambda as shown in the figure. The minimum wavelength found is lambda_(c) and the wavelength of the K_(a)" line is "lambda_(k). As the accelerating voltage is increased.

Answer»

`lambda_(k)-lambda_(c)` increases
`lambda_(k)-lambda_(c)` DECREASES
`lambda_(k)` increases
`lambda_(k)` decreases

Solution :Angular momentum `l=sqrt(n(n+1)0.(h)/(2pi)`
For `H_(2)` and Li second excited state (n=3), l is same.
`l_(H)=l_(Li)`
Now, `E_(n)=(-13.6)/(n^(2)). Z^(2)eV`
`E_(n) alpha (Z^(2)/n^(2))`
Now `Z_(H)=1, Z_(Li)=3 & n=3`
`E_(H)/E_(Li)=1/9`
`E_(H) lt E_(Li)`


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