複選題1. For a metal with specified work function Φ0= 3.1 eV subject to exposure of light with various wavelengths and intensity of 8.01 W/m2 directed at the metal sphere with a radius of 5 cm (A) The maximum wavelength required to stimulate the photoelectron emission is = 350 nm, which is the kind of ultra-violate (UV) (B) Under the exposure of light withλ = 248 nm, the maximum energy of the photoelectrons emitted from the metal is 1.5 eV (C) Under the exposure of light with λ = 155 nm, the maximum energy of the photoelectrons emitted from the metal is 4.5 eV (D) Under the condition that the exposure of light λ = 248 nm and 0.25% of the incident photons create photoelectrons, the number of emitted photoelectrons is (E) The increase of exposure light intensity can increase the photoelectrons numbers and energy