1. what is the source of wave motion? 

2. describe how a wave is different from a pulse. 

3. if we double the frequency of a vibrating object, what happens to its period? 

4. a railroad locomotive is at rest with its whistle shrieking, and then it starts moving towards you. a. does the frequency that you hear increase, decrease, or stay the same? b. how about the wavelength reaching your car? c. how about the speed of sound in the air between you and the locomotive? 

5. what is the frequency of the light emitted by a laser pointer whose wavelength is 670 nm? 

6. the pendulum on a grandfather clock is calibrated so its period equals 1.00 s. 

a. what is the length of the pendulum cable? 

b. if the grandfather clock is moved to the moon where the acceleration due to gravity is 1.63 m/s2 , will the clock keep the correct time? 

c. if not, what can be done to the pendulum to correct the problem?

 7. light from the sun travels 1.5 x 108 km to reach the earth. how long does its journey take in minutes?

 8. determine the wavelength of the microwave radiation emitted by a microwave oven (f = 2.45 x 109 hz).

 9. a light ray approaches a mirror at an angle of incidence of 25°. what is the angle of reflection? did you use the first or second law of reflection to solve this problem?

 10. a light ray approaches a mirror at an angle of 22° with the mirror surface. what is the angle of reflection of this light ray? did you use the first or second law of reflection to solve this problem?

 11. during a physics lab, ray zuvlight observes a laser line passing through an unknown material towards a boundary with air with an angle of incidence of 24.5°. the light ray emerges into the air with an angle of refraction of 33.8°. determine the index of refraction of the unknown material. 

12. trucks often have signs on their backsides that say, "if you can't see my mirrors, i can't see you." explain the physics here.

 13. if, while standing on the bank of a stream, you wished to spear a fish swimming in the water out in front of you, would you aim above, below, or directly at the observed fish to make a direct hit? if you decided to instead zap the fish with a laser, would you aim above, below, or directly at the observed fish? defend your answers. 

14. when launching light down an optical fiber, why is it important to exceed the critical angle?