Out of three radiations of wavelengths `1000Å, 5000Å and 8000Å`, which one corresponds to Lyman series?

The momentum of the photon of wavelength 5000 Å will be

The momentum of the photon of wavelength 5000 Å will be

What is the ratio of velocities of light rays of wavelengths 4000 Å and 8000 Å in vacuum?

The relationship between energy E, of the radiation with a wavelength 8000 Å and the energy of the radiation with a wavelength 16000 Å is

The relationship between energy E, of the radiation with a wavelength 8000 Å and the energy of the radiation with a wavelength 16000 Å is

Give the ratio of velocities of light rays of wavelength 4000Å and 8000Å in vacuum.

Give the ratio of velocities of light rays of wavelength 4000Å and 8000Å in vacuum.

Why is the ratio of the velocities of light of wavelengths 4000 Å and 8000 Å in vacuum 1 : 1?

The photon energy corresponding to a radiation of wavelength 5000 Å is 2.48eV. Find out Planck's constant from this data.

The threshold wavelength for a metal is 4000 Å. A radiation of wavelength 5000 Å is incident on the metal. Can it cause P.E.E?