Continuous emission spectrum is produced by

If the ionisation potential of a helium atom is $24.6 \, V$,the energy required to ionise it will be

$A$ beam of ultraviolet light of all wavelengths passes through hydrogen gas at room temperature,in the $x-$ direction. Assume that all photons emitted due to electron transition inside the gas emerge in the $y-$ direction. Let $A$ and $B$ denote the lights emerging from the gas in the $x$ and $y$ directions respectively.

In a Franck-Hertz experiment,an electron of energy $5.6 \ eV$ passes through mercury vapour and emerges with an energy $0.7 \ eV$. The minimum wavelength of photons emitted by mercury atoms is close to ............. $nm$.

The collision of an electron with kinetic energy $5.5 eV$ and a hydrogen atom in its ground state can be described as

$A$ particular hydrogen-like atom has its ground state binding energy $122.4 \ eV$. It is in the ground state. Then: