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# i need an answer with the usage of logarithm2:55 amA photon of wavelength 4 × 10–7 m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate (i) the energy of the photon (eV), (ii) the kinetic energy of the emission, and (iii) the velocity of the photoelectron (1 eV= 1.6020 × 10–19 J)this is the questionespecially 3rd question

5 years ago
@ shashan
i will give you the approach to this question ,
first calculate the energy of the phototn , that is the frst bit question .
as u knw
E= HV = H C / LAMBDA
U KNW THE VALUE OF LAMBDA . just put the value h is planks constant and c is the speed of light
once u got the energy
now , apply the following formula
E= KE+work function
work function value u knows , e value as calculated in the beginning .
just put the value , u will get the kinetic energy .
and coming to the 3rd bit ,
apply the following formula
K.E = ½ mv square
u have k.e as calculated above , u know the mass of electron , only u hv to calculate velocity square , just put the value nd calculate , after getting veocity square , just put a root over in it to get the velocity .
HOPE U CAN DO THAT
ALL THE BEST ,