Quantum Theory
Practice Test
1.
Compton observed an increase in wavelength with scattered X rays, which meant that the X-ray photons had _________________.
a.
lost momentum only
b.
lost both energy and momentum
c.
gained energy only
d.
gained both energy and momentum
Hint
2.
For the situation depicted in Figure 27-13, what would the kinetic energy of the ejected electrons be if the incident radiation had a wavelength of 200.0 nm and the metal had a work function of 2.56 eV?
a.
1.25 eV
b.
2.40 eV
c.
2.56 eV
d.
3.64 eV
Hint
3.
In the situation depicted in Figure 27-12, if the electron's initial kinetic energy is doubled, what stopping potential would be required?
a.
10.0 V
b.
2.5 V
c.
25.0 V
d.
5.0 V
Hint
4.
The stopping potential,
V
0
, that prevents electrons from flowing across a certain photocell is 6.0 V. What is the kinetic energy in J given to the electrons by the incident light?
a.
6.9×10
-19
J
b.
6.4×10
-19
J
c.
1.60×10
-19
J
d.
9.6×10
-19
J
Hint
