NEET Physics Photo Electric Effect, X- Rays & Matter Waves NEET PYQ-Photo Electric Effect,X-Rays

  • question_answer
    Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled? [NEET 2020]

    A)  four times        

    B)       one-fourth

    C)  zero                 

    D)       doubled

    Correct Answer: C

    Solution :

    [c] \[v=\frac{3}{2}{{v}_{0}}\]
                \[v'=\frac{v}{2}=\frac{3}{4}{{v}_{0}}\]
                \[\because v'<{{v}_{0}}\]
    \[\therefore \] No photoelectric emission will take place.


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