JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Topic Test - Photo Electric Effect, X-Rays & Matter Waves

  • question_answer
    The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = \[6\times {{10}^{-34}}\,J\text{-}sec\])

    A) 100

    B) 1000

    C) \[3\times {{10}^{20}}\]

    D) \[3\times {{10}^{18}}\]

    Correct Answer: C

    Solution :

    [c]\[p=\frac{nhc}{\lambda t}\Rightarrow 100=\frac{n\times 6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{540\times {{10}^{-9}}\times 1}\]\[\Rightarrow \]\[n=3\times {{10}^{20}}\]

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