Question

Photons of energy 2 eV and 2.5 eV successively illuminate a metal whose work function is 0.5 eV. The ratio of maximum speed of emitted electrons is

Answer 1

1.A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U1, at wavelength 500 nm is U2and that at 1000 nm is U3. Wien's constant, b = 2.88 x 106nmK. Which of the following is correct?A.U3= 0B.U1> U2C.U2> U1D.U1= 0