In Compton effect, photons of wavelength λ and frequency υ scatter at angle ϕ with modified wavelength λ′ and frequency υ′ which of the following is true?
(1) λ′ − λ varies with ϕ and also with the scatter
(2) υ − υ′ is independent of the scattering material
(3) λ′ − λ varies with ϕ in proportion to (1 + cos ϕ )
(4) λ′ − λ is independent of the scatterer but varies with ϕ
