2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-23

  • question_answer
    The wavelength of \[{{K}_{\alpha }}\]line from an element of atomic number 41 is\[\lambda .\]Then the. wavelength of\[{{K}_{\alpha }}\]line of an element of atomic number 21 is

    A) \[4\,\lambda \]                         

    B) \[\frac{\,\lambda }{4}\]

    C) \[3.08\,\lambda \]                    

    D) \[0.26\,\lambda \]  

    Correct Answer: B

    Solution :

    From Moseley?s low, we have \[\frac{{{\upsilon }_{41}}}{{{\upsilon }_{21}}}={{\left( \frac{41-1}{21-1} \right)}^{2}}=4\]\[\therefore \]\[{{\lambda }_{21}}=\frac{{{\lambda }_{41}}}{4}=\frac{\lambda }{4}\] Hence, the correction option is [b].


You need to login to perform this action.
You will be redirected in 3 sec spinner