Practice Test #3- Chapters 23, 24 and 27 from Giancoli 5ed
1. A real object is placed 10 cm from a converging lens that has
a focal length of 6 cm. Which statement is most accurate?
a.
b.
c.
d.
The
The
The
The
image
image
image
image
is
is
is
is
real,
real,
real,
real,
erect and enlarged.
erect and reduced.
inverted and enlarged.
inverted and reduced.
2.What is the magnification of a lens that forms an image 20 cm
to its right when a real object is placed 10 cm to its left?
3. An object is placed 30 cm from a converging lens with a focal
length of 8 cm. Find the image distance and the magnification of
the lens.
4. An object is placed 30 cm from a diverging lens with a focal
length of 8 cm. Find the image distance and the magnification of
the lens.
5. When an electron is accelerated to a higher speed, there will
be a decrease in its (a) energy, (b) frequency. (c) wavelength.
(d) momentum. (e) All of the above.
6. Bohr model of the atom suggests that the electron in hydrogen
can occupy (a) orbits of any radius. (b) only a certain set of
orbits with definite radii. (c) only orbits where the electron
couldn't jump from one to the next. (d) only orbits where the
electron couldn't move at all. (e) None of the above.
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Practice Test #3- Chapters 23, 24 and 27 from Giancoli 5ed
7. An atom emits a photon when on of its electrons (a) collides
with another one of its electrons. (b) undergoes a transition to
a state of lower energy. (c) undergoes a transition to a state of
higher energy. (d) loses its charge. (e) None of the above is
true.
8.
A photon has a wavelength of 663 nm (1 nm = 10-9 m). What is
the momentum of the photon?
9. A photon has a wavelength of 663 nm is incident upon a
metallic surface, and as a result electrons are ejected with a
kinetic energy of 1 x 10-19 J, what is the work function of the
metal?
10. What is the critical wavelength for the metal in question
(9)?
11. What frequency of electromagnetic radiation has energy
4.7X10-25 J?
12. How much energy is carried by a photon with frequency 150
GHz?
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Practice Test #3- Chapters 23, 24 and 27 from Giancoli 5ed
13. What is a photon?
a. An electron in an excited state
b. A small packet of electromagnetic energy that has
particle-like properties
c. One form of a nucleon, one of the particles that makes up
the nucleus
d. An electron that has been made electrically neutral
e. Another name for a neutrino
14. A metal has a work function of 4.5 eV. Find the maximum
kinetic energy of the photoelectrons if the wavelength of
light is 250 nm.
15. A metal surface is illuminated with blue light and electrons
are ejected at a given rate each with a certain amount of
energy. If the intensity of the blue light is increased,
electrons are ejected
a. at the same rate, but with more energy per electron.
b. at the same rate, but with less energy per electron.
c. at an increased rate with no change in energy per
electron.
d. at a reduced rate with no change in energy per electron.
16. If the scattering angle in Compton's scattering is 90ø.
is the wavelength shift?
What
17. What is the de Broglie wavelength of a ball of mass 200 g
moving with a speed of 30 m/s?
18. A hydrogen atom in ground state absorbs a photon of energy
12.09 eV. To which state will the electron make a
transition?
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Practice Test #3- Chapters 23, 24 and 27 from Giancoli 5ed
19. The wavelength of a ruby laser is 694.3 nm. What is the
energy difference between the two energy states involved in
laser action?
20.
Light of wavelength 575 nm falls on a double-slit and the third order bright fringe
is seen at an angle of 6.5. What is the separation between the double slits?
21.
400 nm of light falls on a single slit of width 0.10 mm. What is the angular width
of the central diffraction peak?
22.
Light of wavelength 610 nm is incident on a slit 0.20--mm wide and the diffraction
pattern is produced on a screen that is 1.5 m from the slit. What is the width of the
central maximum?
23.
Monochromatic light of wavelength 500 nm is incident normally on a grating. If
the third-order maximum of the diffraction pattern is observed at 32.00, what is the
grating constant (distance between the slits)?
24.
A diffraction grating has 6000 lines per centimeter ruled on it. What is the angular
separation between the second and the third orders on the same side of the central
order when the grating is illuminated with a beam of light of wavelength 550 nm?
25.
A diffraction grating has 4000 lines per cm. The angle between central maximum
and the third order maximum is 360. What is the wavelength of the light?
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