1. What is a storm surge?

2. The rough surface of a breakwater made of heaps of huge boulders is intended to do what to do what to wave energy?

3. What might cause the super waves sometimes encountered by ships rounding the Cape of Good Hope?

4. Our eye can not detect an event if it occurs in less than 1/20th of a second. What frequency is this?

5. On a sky hill, 10.4 skiers pass an observer in 42 s. Find their: a) frequency b) period?

6. If 0.7 of a blue whale passes a scuba diver in 17 s, what is the whale's: a) frequency b) period?

7. If 56 yellow bellied sap suckers pass a birder in 25 s, what is their frequency and period?

8. At sporting events, peer pressure may result in the appearance of "the wave". What features of one type of mechanical wave does it model?

9. At rock concerts, excitement-induced bonding among fans may result in rows of complete strangers swaying from side to side, just like old friends. What features of one type of mechanical wave does this behavior model?

10. a) Surfers prefer to spend their time on what part of a wave? b) Why?

11. A 2.5 m long water wave has a frequency of 4.5 c/s. Find its: a) speed b) period

12. A 1.3 m long wave moves at 18 m/s. Find its: a) frequency b) period

13. a) Find the speed of a 1.8 m long wave with a frequency of 15 Hz.
b) How long will it take the wave to travel 1 km?

14. A 3 m long wave travels 300 m in 5 min. Find its: a) speed b) frequency c) period

15. a) A pair of wave crests travel 60 cm in 2 s. Find their speed.
b) If the crest to crest distance is 0.5 m, find their frequency.

16. a) Find the wavelength of a 10 000 c/s wave travelling at 4 800 m/s.
b) It would take how long to echo from, i.e., reach and reflect from, an object 1 200 m distant?
c) If the wave echoes from an object in 0.34 s, how distant is it?

17. a) What is the speed of electromagnetic waves, e.g., radio, light, TV, microwave, X-rays?
b) If a radio wave is 21 cm long, what is its frequency?
c) What is the wave's period?
d) A radar echo will return from an asteroid 2 * 10¹² km away in what time?
e) If a storm system returns a weather radar echo in 0.4 s, how far away is it?

18. A tuning fork vibrating 256 times a second (c/s) produces a 130 cm long wave. Find its speed.

19. Find the speed of sound when the Tair is: a) -15⁰C b) 30⁰C c) - 25⁰C d) 10⁰C.

20. What Tair will cause sound to move at: a) 340 m/s b) 300 m/s c) 250 m/s d) 370 m/s?

21. a) Find the wavelength of the sound from a 412 Hz tuning fork when the Tair = 20⁰C.
b) Redo with a 312 Hz tuning fork and a Tair of - 10⁰C.

22. a) An underwater sound moving at 1 485 m/s reaches a SCUBA diver in 0.6 s. How long would it take a sound moving in air at 374 m/s to travel an equal distance?
b) A sound travels 3 900 m in - 5⁰C air. How far would the sound travel underwater at 1 430 m/s in the same length of time?

23. How long will it take sound to travel 1 km in 10⁰C air?

24. How far will a sound travel in 2.5 s if the Tair = - 15⁰C?

25. a) A thunder clap is heard 8 s after a lightning flash is seen. If the Tair = 33⁰C, what is the distance to the flash?
b) If the Tair is 35⁰C, a thunder clap will reach a person 7 km away in what time?