Grade 11 Physics – Waves Test #1 Review
1. What is a wave?
2. What are the parts of transverse and longitudinal waves?
3. In a transverse wave, the particles move ______to the direction of the wave. In a longitudinal wave, the particles move ______to the direction of the wave.
4. Sound cannot travel in a vacuum. Explain why.
5. Name 3 types of electromagnetic waves (we discussed 7 in class)
6. How fast do radio waves travel in a vacuum?
7. Convert the following:
a. 8.24mm = ______hm
b. 0.000121m = ______mm
8. 18 waves pass in 5.0s. What is the frequency and period of the waves?
9. A wave has a frequency of 16µHz. What is the period of the wave?
10. 12 light waves pass in 3.2s, what is the frequency and period?
11. A wave has a speed of 22km/s, if the frequency is 12nHz, what is the wavelength?
12. CITI-FM broadcasts at 92.1MHz. What is the wavelength of these waves?
13. What happens to a pulse when it reaches a fixed end of a slinky? Free end?
14. Choose the best answer: When a wave passes through a boundary into a heavier medium, the wave
a. Speeds up.
b. Slows down.
c. Stays the same speed.
15. Choose the best answer: When a wave passes through a boundary into a lighter medium, the transmitted pulse is
a. On the same side.
b. On the opposite side.
c. Does not exist.
16. Draw the resulting pulse:
(a) (b)
17. What is a natural frequency? What is a harmonic? What is an overtone?
18. If a standing wave has 3 antinodes, what harmonic is it? What overtone is it?
19. A violin string has a length of 0.60m and a fundamental frequency of 310Hz. The string is vibrating with its frequency equal to the 3rd harmonic.
a. What is the frequency of this vibration?
b. What is the wavelength of this vibration?
c. What is the speed of this wavelength?
20. A wave has a fundamental frequency of 250Hz. Find the 11th harmonic frequency. Which overtone is it?
21. 6 nodes are counted on a 75cm spring. This includes the 1 node on each end.
a. If the velocity of the waves creating this standing wave pattern is 4.5m/s, what is their frequency?
b. What harmonic is this?
22. A string is vibrating in its 4th harmonic. How many nodes (including the ones on the end) are in this standing wave?
23. What are the names of the following effects?
a.
b.
24. Look at the picture below and answer the questions on the bottom of the page.
a. Draw in the centre line and all nodal lines.
b. Calculate the path difference using P1.
c. Calculate the wavelength by using P2.
d. Does destructive or constructive interference occur at the square?
e. What would be the distance between P3 and S1 if the wavelength was 5.0cm?
25. A point on a nodal line has a path difference of 8½ λ. Which nodal line is it on? (This question does not use the above picture).
Answers:
1. See notes
2. See notes, label A, λ, crest, trough, etc.
3. perpendicular, parallel
4. Sound is a mechanical wave, it requires a medium.
5. radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, gamma rays
6. 3 x 108m/s
7. (a) 0.0000824hm (b) 0.121mm
8. f = 3.6Hz, T = 0.278s
9. T = 62 500s
10. f = 3.75Hz, T = 0.267s
11. 22km/s = 22000m/s and f = 12 x 10-9Hz, so λ = 1.83 x 1012m
12. 3.26m
13. see notes
14. b. Slows down
15. a. On the same side
16. (a) (b)
17. see notes
18. 3rd harmonic, 2nd overtone
19. (a) 930Hz (b) 0.40m (c) 372m/s
20. 10th overtone. 11th harmonic = 2750Hz
21. (a) 15Hz (b) 5th harmonic
22. 5 nodes
23. (a) refraction (b) diffraction
24. (a)
25. (b) approximately 0.9cm (c) approximately 1.93cm
(d) destructive interference (e)15cm
26. n = 9
K. Byrnes
PHY30S