A proton and electron, both at rest initially, combine to form a hydrogen atom in ground state. A single photon is emitted in this process. What is the wavelength?

A proton traps a free electron to form the hydrogen atom of lowest energy level. If photon is emitted in this process then what will be its wavelength. Assume initial kinetic energy of the electron to be zero.

The electron in a hydrogen atom is in n=2 state. When it drops to the ground state a photon is emitted. What is the wavelength of photon?

An electron and proton are separated by a large distance. The electron starts approaching the proton with energy 3 eV. The proton captures the electrons and forms a hydrogen atom in second excited state. The resulting photon is incident on a photosensitive metal of threshold wavelength 4000Å What is the maximum kinetic energy of the emitted photoelectron?

A hydrogen atom, initially at rest in the n = 3 quantum state, undergoes a transition to the ground state, emitting a photon in the process. What is the speed of the recoiling hydrogen atom?

A proton traps a free electron to form the hydrogen atom of lowest energy level. The wavelength of photon emitted in this process will be (assume initial kinetic energy of the electron to be zero)

A hydrogen atom initially in the ground level absorbs a photon and is excited to n=4 level then the wavelength of photon is

A hydrogen atom initially in the ground level absorbs a photon and is excited to n=4 level then the wavelength of photon is

An electron makes transition form n=3 , n=1 state in a hydrogen atom. The maximum possible number of photons emitted will be

In absorbing 10.2 eV energy, the electron of a hydrogen atom jumps from its initial orbit to next higher energy orbit . As the electron returning to the former orbit, a photon is emitted. What is the wavelength of this photon ?