MCQ
Bohr proposed his atomic model based on :
- AOil drop experiment.
- ✓Planck's quantum theory.
- C$x-$ ray scattering experiment.
- DExperiments on conduction of gases.
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The frequency of the wave is $\mathrm{x} \times 10^{19} \mathrm{~Hz}$. $x=$ . . . . (nearest integer)

$(V=33\, volt)$ $(m_p = 1.672 \times 10^{-27} \,kg)$