28.A wave has a frequency of 0.03 Hz and a wavelength of 1.2 m. What is the wave speed?

29.What part of a wave shows the wave's energy?

1. period
2. amplitude
3. wavelength
4. none of the above

30.A wave pulse encounters a free boundary. What happens?

1. The wave reflects identically
2. The wave reflects and inverts
3. The wave passes into the new medium with no change
4. The wave passes into the new medium and gets smaller

31.A metronome ticks back and forth 60 times every minute. This information is telling us which quantity?

1. period
2. frequency
3. amplitude
4. wavelength

32.A wheel rotates 140 times every minute. What is the period of the wheel?

33.Refraction is the property of light which describes

1. how light travels through a vacuum
2. how light bounces off of reflective surfaces
3. how light is made up of oscillating electric and magnetic fields
4. how light bends when it enters a new medium

34.Which is NOT true of interfering waves? (draw a sketch then identify the choice)

1. waves that overlap change the amplitude
2. waves that overlap bounce off of one another
3. amplitudes on the same side of equilibrium will create larger amplitudes
4. waves that interfere will pass through one another

35.A sound wave travels from air into the ground. What happens to the speed of the wave?

1. it decreases
2. it increases
3. it stays the same
4. cannot be determined