A narrow slit of width 2 mm is illuminated by monochromatic light of wavelength 500 nm. The distance between the first minima on either side on a screen at a distance of 1 m is
5 mm
0.5 mm
1 mm
10 mm
If e/m of electron is 1.76 x 1011 C kg-1 and the stopping potential is 0.71 V, then the maximum velocity of the photo-electron is
150 kms-1
200 kms-1
500 kms-1
250 kms-1
C.
500 kms-1
From condition of stoping potential