# Pre-AP PHYSICS PRETEST CH 14 23 by aah15699

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```									                  Pre-AP PHYSICS PRETEST CH 14 & 23
DEFINE

1. opaque
2. transparent
3. luminous
4. illuminated
5. Michelson
6. photons
7. ray
8. beam
9. focus
10. Einstein
11. Planck
12. photoelectric effect
13. corpuscular theory
14. rectilinear propagation
15. Huygen’s Principle
16. inverse square law
17. monochromatic
18. visible spectrum
19. plane mirror
20. convex mirror
21. concave mirror
22. real image
23. virtual image
24. spherical aberration
25. complementary colors
26. angle of incidence
27. angle of reflection
28. law of reflection
29. principal axis
30. center of curvature
31. principal focus
32. upright
33. inverted
34. diffused reflection

MULTIPLE CHOICE

1. In an evacuated tube, a zinc plate exposed to ultraviolet light:   A) acquires a negative charge,   B) gains protons,
C) gains electrons, D) acquires a positive charge.

2. In photoelectric emission, doubling the intensity of the incident light:  A) doubles the rate of emission of
photoelectrons, B) doubles the kinetic energy of photoelectrons, C) halves the rate of emission of photoelectrons,
D) halves the kinetic energy of photoelectrons.

3. For spherical mirrors of small aperture, the radius of curvature divided by the focal length gives a quotient of:
A) 0.5, B) 1.0, C) 1.5, D) 2.0.

4. In the case of convex mirrors: A) f and d i are both positive, B) f is positive, but di is negative, C) f is negative,
but di is positive, D) f and di are both negative.

5. If you know the wavelength of any form of electromagnetic radiation, you can determine its frequency because:
A. all wavelengths travel at the same speed.           B. the speed of light varies for each form.
C. wavelength and frequency are equal.                 D. the speed of light increases as wavelength increases.
6. If you are reading a book and you move twice as far away from the light source, how does the brightness at the
new distance compare with that at the old distance? It is:                A. one-eighth.            B. one-fourth.
C. one-half                          D. twice.
7. In the diagram above, the image of object B would be:
A. virtual, enlarged, and inverted.          B. real, enlarged, and upright.
C. virtual, reduced, and upright.            D. virtual, enlarged, and upright.

8. In the diagram above, the image of object B would be:
A. real, reduced, and upright.               B. virtual, enlarged, and upright.
C. virtual, reduced, and inverted.           D. virtual, reduced, and upright.

1. What event caused the downfall of Newton’s corpuscular theory of light?

What event caused the downfall of Huygen’s wave theory of light?

2. Write Einstein’s equation for the maximum kinetic energy of photoelectrons and explain each term.

Use Einstein’s equation to explain cutoff frequency.

3. If light travels 35.385 5 km through air in 1.180 58 x 10 -4 s, what is the speed of light in air in km/s?

4. A concave mirror has a focal length of 15 cm. An object 1.8 cm high is located                   20 cm from the mirror.
Calculate the location and size of the image. What is its type and orientation?

5. The focal length of a convex mirror is 4.0 cm. An object 2.0 cm high is 10.0 cm from the mirror.             Calculate the
location and size of the image. What is its type and orientation?

6. A concave mirror has a focal length of 5.0 cm. An object 0.75 cm high is 3.0 cm from the mirror. Calculate the
location and size of the image. What is its type and orientation?

7. What is the energy of a photon whose wavelength is 2.0 x 10 -7 m?

8. What is the energy of a photon whose frequency is 3.0 x 1014 Hz?
(h = 6.63 x 10-34 J•s)

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