Radiation coming from transition `n = 2 to n = 1` of hydrogen atoms falls on helium in `n = 1 and n= 2` state what are the possible transition of helium ions as they absorb energy from the radiation?

Radiation coming from trasitions n=2 to n=1 of hydrogen atoms fall on He^(+) ions in n=1 and n=2 states. The possible trasition of helium ions as they absorb energy from the radiation is:

If lambda = wavelength of hydrogen atom for the transition n = 3 to n'= 1, then the wavelength of the doubly ionised lithium ion for the same transition is

The wavelength of the radiation emitted by a hydrogen atom in the electronic transition from n=3 to n=2 is lambda . For the same transition in the singly ionized helium, the wavelength of the emitted radiation is

In a hypothetical atom, if transition from n=4 to n=3 produces visible light then the possible transition to obtain infrared radiation is:

In a hypothetical atom, if transition from n=4 to n=3 produces visible light then the possible transition to obtain infrared radiation is:

The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

The transition from the state n = 4 to n = 1 in a hydrogen like atom result in ultraviolet radiation. Infrared radiation will be obtained in the transition from

The transition form the state n = 3 to n = 1 in a hydrogen-like atom results in ultraviolet radiation. Infared radiation will be obtained in the transition from

The transition form the state n = 3 to n = 1 in a hydrogen-like atom results in ultraviolet radiation. Infared radiation will be obtained in the transition from

The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from :