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1.
An important spectral emission line has a wavelength of 21cm. The corresponding photon energy is 
Js and 
Js and
2.
Photons of energy of 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photoelectrons will be
3.
A ratio transmitter operates at a frequency 880 kHz and a power of 10 kW. The number of photons emitted per second is