1. Light of wavelength 550 nm in air in found to travel at 1.96x108 m/s in a certain
liquid. Determine the wavelength of the light in the liquid.
a.
b.
c.
d.
550 nm
359 nm
281 nm
303 nm
2. In a Young’s double slit experiment, if the separation between the two slits is
0.050 nm and the distance from the slits to a screen is 2.5 m, find the spacing
between the first-order and second-order bright fringes for light with wavelength
of 600 nm.
a.
b.
c.
d.
1.5 cm
3.0 cm
4.5 cm
6.0 cm
3. If a wave from one slit of a Young’s double slit experiment arrives at a point on
the screen one-half wavelength behind the wave from the other slit, which is
observed at that point?
a.
b.
c.
d.
bright fringe
dark fringe
gray fringe
multi-colored fringe.
4. Light of wavelength 580 nm is incident on a slit of width 0.300 mm. An
observing screen is placed 2.00 m from the slit. Find the position of the first order
dark fringe from the center of the screen.
a.
b.
c.
d.
0.26 mm
1.9 mm
3.9 mm
7.7 mm
5. In terms of the wavelength of light in soapy water, what is the minimum thickness
of soap film that will reflect a given wavelength of light?
a.
b.
c.
d.
one-fourth wavelength
one-half wavelength
one wavelength
There is no minimum thickness.
6. What is the minimum thickness of a nonreflecting film coating (n=1.30) on a
glass lens (n=1.50) for wavelength 500 nm?
a.
b.
c.
d.
250 nm
192 nm
167 nm
96.2 nm
7. What power lens is needed to correct for farsightedness where the uncorrected
near point is 75 cm?
a.
b.
c.
d.
–2.7 D
+2.7 D
+5.3 D
None of the above.
8. A magnifying lens has a focal length of 10 cm. A person has a near point of 25
cm. What is the magnification of the lens for that person when their eyes are
focused at their near point?
a.
b.
c.
d.
1.5
2.5
3.5
4.5
9. A student constructs an astronomical telescope with a magnification of 10. If the
telescope has a converging lens of focal length 50 cm, what is the focal length of
the eyepiece?
a. 2.5 cm
b. 5.0 cm
c. 10 cm
d. 25 cm
10. A binary star system in the constellation Orion has an angular separation of 10-5
rad. If the wavelength of the light from the system is 500 nm, what is the smallest
aperture (diameter) telescope that can just resolve two stars?
a.
b.
c.
d.
0.50 cm
0.61 m
5.0 cm
6.1 cm
11. With what color light would you expect to be able to see the greatest detail when
using the microscope?
a.
b.
c.
d.
red, because of its long wavelength
yellow, because of its right wavelength
blue, because of its shorter wavelength
color does not matter.
12. Relative to a stationary observer, a moving clock
a.
b.
c.
d.
always runs slower than normal
always runs faster than normal
keeps its normal time
can do any of the above. It depends on the relative velocity between the
observer and the clock.
13. The closest start to our solar system is Alpha Centauri, which is 4.30 light years
away. A spaceship with a constant speed of 0.800c relative to the Earth travels
toward the star. What distance does the space ship travel according to a passenger
on the ship?
a. 2.58 ly
b. 3.52 ly
c. 4.12 ly
d. 4.30 ly
14. The kinetic energy of a proton is 80% of its total energy. What is the speed of the
proton?
a. 0.02c
b. 0.87c
c. 0.98c
d. 1.0c
15. During the reaction, an element loses 4.8x10-28 kg of mass. How much energy (in
Joules) is released?
a.
b.
c.
d.
4.3x10-11 J.
1.4x10-19 J.
1.6x10-36 J.
5.3x10-45 J.
16. What is the wavelength corresponding to the most intense light emitted by a giant
star of surface temperature 4400 K?
a.
b.
c.
d.
655 nm
657 nm
659 nm
661 nm.
17. Planck’s constant
a. sets an upper limit to the amount of energy that can be absorbed or
emitted.
b. Sets a lower limit to the amount of energy that can be absorbed or emitted.
c. Relates mass to energy.
d. Does none of above.
18. A metal has a work function of 4.5 eV. Find the maximum kinetic energy of the
photoelectrons if the wavelength of light is 300 nm.
a.
b.
c.
d.
zero
0.37 eV
0.46 eV
0.53 eV
19. In the photoelectric effect, the energies of the ejected electrons
a. Are proportional to the speed of light
b. Are proportional to the intensity of light.
c. Are proportional to the frequency of light.
d. Vary randomly
20. A beam of X-rays of frequency f is incident upon a substance that scatters the
beam in various directions. If we measure the frequency of the scattered X-rays,
we will find
a.
b.
c.
d.
X-rays with frequency less than f.
X-rays with the frequency greater than f
Only X-rays with frequency f.
X-rays with frequencies ranging from less than f to greater than f.
21. The electron of a hydrogen atom makes a transition from the n=4 state to the n=2
state. What is the wavelength of the emitted photon?
a.
b.
c.
d.
344 nm
434 nm
443 nm
523 nm
22. The distance between adjacent orbit radii in a hydrogen atom?
a. Increases with increasing values of n.
b. Decreases with increasing values of n.
c. Remains constant for all values of n.
d. Varies randomly with increasing values of n.
23. Consider ground-state helium holding two electrons in orbit. If one of the
electrons has quantum numbers (n, l , ml, ms) of 1, 0,0, -1/2 respectively, the quantum
numbers for other electron will be
a.
b.
c.
d.
1, 1, 0, -1/2
1, 0, 0, +1/2
1, 1, 1, +1/2
None of the above.
24. The wave equation for hydrogen atom has solutions only if the three quantum
numbers n, l , ml, meet certain conditions. One of these conditions specifies that l:
a.
b.
c.
d.
is either zero or +1
is either equal or less than n-1
is a positive integer
has an absolute value that is either equal or less than n.
25. The probability of finding an electron in a hydrogen atom is directly proportional to
its
a.
b.
c.
d.
energy
momentum
wave function
square of the wave function
26. A hydrogen atom is in the 6th state. Determine the principal quantum number.
a.
b.
c.
d.
0
5
6
7
27. The binding energy per nucleon is
a.
b.
c.
d.
directly proportional to atomic number
inversely proportional to atomic number
the same for all atoms
none of the above
28. When a + particle is emitted from an unstable nucleus, the atomic number of the
nucleus
a. increases by 1.
b. Decreases by 1.
c. Does not change
d. None of the above.
29. What is the probability that an atom will decay this year if its half-life is 247 years?
a.
b.
c.
d.
0.0017
0.0028
0.017
0.071
30. A radioactive substance with a half-life of 3.0 days has an initial activity of 0.24 Ci.
What is its activity after 6.0 days?
a. 0.12 Ci
b. 0.48 Ci
c. 0.06 Ci
d. none of the above.