1. Physics Sem. 2 Final Review

2. What type of charges attract?
Like b. Unlike c. Round d. Square B.

3. Charged objects can attract to neutral objects? T or F

4. Coulomb’s law states that the force between two charges is _____ related to the separation.
A. Inversely b. inverse squarely
c. Directly d. Parabolically B.

5. The force on two charged particles with a charge of 1C and are separated by 1m is:
A. 1N B. 9X109N C. 10N C. 1X10-19N B

6. What force would a 1x10-10C charge experience in a 3x1010N/C electric field?
3N B N C. 3x1020N D. 1N 3N

7. What is the current in a circuit with a
45 ohm resistor and a 9V battery?
405A b. 54A c. 0.2A d. 0.5A C

8. If a 5, 10 and 15 ohm resistor are added in parallel, what is the effective resistance?
2.7 Ohms

9. How much power is dissipated if a current of 1
How much power is dissipated if a current of 1.2A is flowing through an appliance with an applied voltage of 120V?
10W B. 0.1W C W D. 144W D

10. What type of wave is a sound wave? A. Transverse B. Longitudinal
C. Electromagnetic
D. A pulse B

11. What part of a standing wave never moves? A. Loops B. Antinodes
C. Nodes
D. Crests C

12. What does the speed of a mechanical wave depend on?
Ans.
The medium!

13. The vibration of a tuning fork can be measured in what?
Ans. Hz

14. Determine the angle of refraction if a ray enters glass (n=1
Determine the angle of refraction if a ray enters glass (n=1.5) from air 9n=1.0) at 30 degrees.
n1sinƟ1=n2sinƟ2
1.0sin30 = 1.5sinƟ2
Ɵ2 = 19.5 degrees

15. The vibration of a tuning fork can be measured in what?
Ans. Hz

16. If you strike a tuning fork , then strike it again a little harder, what are you changing?
Ans.
The Amplitude

17. Light is a _____ wave, and Sound is a _____ wave.
Ans.
Electromagnetic, longitudinal

18. A concave mirror has a focus of 20cm. What is the radius of curvature?
Ans.
40cm

19. A. Have two spherical surfaces. B. Are thinner in the middle.
Convex lenses always:
A. Have two spherical surfaces.
B. Are thinner in the middle.
C. Are thicker in the middle.
D. Are flat glass plates.
Ans. C

20. Refraction occurs when: A. The angle of reflection is 0.
B. The angle of incidence equals 0.
C. Light hits the boundary of two materials with the same optical density.
D. Light hits the boundary of two materials with different optical density’s.
Ans. D

21. When light forms a rainbow, that is an example of: A. Dispersion
B. Refraction
C. Diffraction
D. Interference
Ans. A

22. Compared to lights speed in a vacuum, it travels _____ in other media.
Ans.
Slower!

23. How does a sound wave compare to a microwave?
Ans.
Sound is longitudinal and mechanical, microwaves are electromagnetic and can travel through a vacuum

24. Sound
A physics experiment was done where a tuning fork is held above a tube. The speed of sound is 343 m/s. What is the first frequency which a 0.33 m long open tube will resonate?
f= v/2L
f= 343/2(.33)
f = 520Hz