If the wavelength of an electromagnetic radiation is 2000 A. what is its energy in ergs?

The wavelength of an electromagnetic radiation is lamda . What is the energy of a photon of this radiation?

If the wavelength of electromagnetic radiation is doubled, what happens to the energy of photon ?

The wavelength of the electromagnetic radiations whose photon has energy of 5eV is

The wavelength of electromagnetic radiation is doubled. What will happen to the energy of the photons of the new radiation ?