Question

Many electrons travelling at 30m/s are directed through a double slit. The slits have a sepa- ration of 0.06 mm. An array of detectors is placed 5m from the slit. (a) What is the de Broglie wavelength of the electrons?

(b) How far off axis is the first zero-intensity point on the detector array?

(c) When a electrons reaches a detector, can we say which slit the electrons has passed through? Explain.

Don't use cursive

Answer 1

mv h=Planic's constant = 6.63*10-34 Ag m² see m= mass of electron - 9-1410-31109 ve velocity d = 6.63x10-34 9.1X10-31 150 x=2.42x10-5 m = 2:43x10 m 2=5m d=0.06 mm inan x= dL - 2.43x10-5x5 2d 0.06x10-3 x=> 2-025 m 2.025m far is the first zero intensity on the detector array one 3) we cannot say the electron passed through the slit, we can only say, it passed through the slits (both silts)