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clear;
clc;
printf("\nEx2.43\n");
//page no.-88
//given
h=6.624*10^-27;..........//planck's constant in ergs-sec
m=9.1*10^-28;.........//mass of electron in kg
w=3.2*10^-12;.........//work function in joule
c=3*10^10;...........//speed of light in cm/sec
lambda=3600*10^-8;...//wavelength in m
e=1.6*10^-12;.........//charge in ergs
lambda_o=(h*c)/w;..........//threshold wavelength in cm
vo=c/lambda_o;........//threshold frequency in m/s
v=c/lambda;..........//frequency
E=((v-vo)*h)/e.................//energy in eV
printf("\nkinetic energy is 1.45 eV\n");
printf("\nso stopping potential is 1.45 eV\n");
v=sqrt((2*E*e)/m)............//velocity of electron in cm/sec
printf("\nVelocity of electron is 7.1*10^7 cm/sec\n");
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