Question

1) Two elements have photoelectric work functions given by Wn= 570 eV and Wm= 681 eV, respectively. If both metals are illuminated by UV radiation of the same wavelength. Calculate the difference of the maximum kinetic energy of photoelectrons from each surface if wavelength = 298 nm

1.78 x 10^-17 J

111 J

1.34 x 10^-19 J

2.00 x 10^-16 J

2) Two slits have a separation, 6.34 x 10^-2 m. An interference pattern is created 9.71 m away from the slits, with a distance 0.203 m between the central bright fringe and the 6th dark fringe below it. What is the wavelength of light used to create the pattern?

3.31 x 10^-4 m

8.83 x 10^-4 m

0.104 m

2.41 x 10^-4 m

3) What is the wavelength of light with constructive interference reflected from a thin film vacuum, with an index of refraction 1.13, a thickness of 6.10 x 10^-9 m; which is the minimum thickness necessary?

1.08 x 10^-8 m

2.76 x 10^-8 m

1.38 x 10^-8 m

3.45 x 10^-9 m

Answer 1