Which of the following statements is false?

  • A
    Splitting of spectral lines in an electrical field is called the $Stark$ effect.
  • B
    Frequency of emitted radiation from a black body goes from a lower wavelength to a higher wavelength as the temperature increases.
  • C
    $A$ photon has momentum as well as wavelength.
  • D
    The $Rydberg$ constant has the unit of energy.

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The emission spectrum of hydrogen is found to satisfy the expression for the energy change $\Delta E$ (in joules) such that $\Delta E = 2.18 \times 10^{-18} \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right) \, J$ where $n_1 = 1, 2, 3 \dots$ and $n_2 = 2, 3, 4 \dots$. The spectral lines correspond to the Paschen series when:

Ratio of velocities of electrons of hydrogen atom in $1^{st}$,$2^{nd}$,$3^{rd}$ orbit is

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