The wavelength of blue light is $480 \ nm$. What is the frequency of this light?

  • A
    $4.8 \times 10^9 \ Hz$
  • B
    $2.25 \times 10^{14} \ Hz$
  • C
    $6.25 \times 10^{14} \ Hz$
  • D
    $5.25 \times 10^9 \ Hz$

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Calculate the energy per mole of photons of electromagnetic radiation having a wavelength of $700 \ nm$. $\left[h = 6.626 \times 10^{-34} \ J \ s, c = 3 \times 10^8 \ m/s, N_A = 6.022 \times 10^{23} \ mol^{-1}\right]$

Assertion : Absorption spectrum consists of some bright lines separated by dark spaces.
Reason : Emission spectrum consists of dark lines.

The ejection of the photoelectron from the silver metal in the photoelectric effect experiment can be stopped by applying a stopping potential of $0.35 \ V$ when radiation of $256.7 \ nm$ is used. Calculate the work function for silver metal.

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