If the work function of two metals X and Y are 4.17eV and `8.24x10^(-19)`J respectively, then for which metal lesser amount of energy will be required to emit an electron?

Two metals X and Y have work functions 2eV and 5eV respectively. Which metal will emit electrons, when it is irradiated with light of wavelength 400 nm and why?

The energies of the electron in the second and the third Bohr orbits of the hydrogen atoms are -5.42xx10^(19)J and -2.41xx10^(19)J respectively. Calculate the wavelength (in S.I. unit) of the emitted radiation, when the electron jumps from the third to the second orbit.

Light of wavelength 3500 Å is incident on two metal surface A and B . Will both the metal surface yield photoelectrons, if their work function are 4.2 eV and 1.9 eV respectively? What is the kinetic energy of the fastest electron?

The work function of a metallic surface is 2.5 eV. Ultraviolet light of wavelength 2000Å is allowed to be incident on the metallic surface. Calculate Stopping potential. (Given Planck's constant h = 6.63 xx 10^(-34) J-s , electronic charge e = 1.6 xx 10^(-19) C, electron mass m = 9.1 xx 10^( -31) kg

An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. Which is faster, the electron or the proton? QBtain the ratio of their speeds, (electron mass = 9.11 xx10^31 kg, proton mass = 1.67 x 10-^27 kg, 1 eV = 1.60 x 10-^9 J)