1. W AVES IN 2D
T EST R EVIEW
1. Draw a circular and a plane wavefront, and label
the wavefront. Draw in a wave ray for each of
these.
2. Draw the following diagram. Label the wavefront,
wave ray and the angle of incidence.
3. Add to your drawing two reflected wavefronts, a
reflected wave ray and label the angle of
reflection.
4. State the law of reflection.
2. 5. A man who stands 2 meters tall
stands in front of a mirror. He is a
smart man, so he has a large
forehead (the top of his head is 20
cm above his eyes). What size of
mirror would he need and where on
the wall should he place it if he
wants to see is shoes and the top
of his head.
6. A plane water wave (straight)
approaches a parabolic
barrier (a semi-circular beach
shore). Draw a diagram of two
incident wave fronts, two
reflected wave fronts. Add
wave rays to these.
**Provide an example (with picture) of one way
we used reflection in order to produce energy.
7. Describe the reflected wave front that occurs
when a circular wave originates at the focal point
of a parabolic barrier.
3. 8. Measure the angle at which mister Vincent shines
a laser through the small glass box at the front.
Calculate the theoretical angle of refraction.
9. When waves go from deep water into shallow
water, what happens to the wavelength,
frequency and velocity of that wave?
10. Refraction refers to:
11. Label all important parts of this diagram? What
situation does this represent?
4. 12. When waves travel from shallow water into
deeper water at an angle, what happens to their
speed? Their wavelength? What type of
refraction does this cause? (with respect to the
normal)
13. A water wave of frequency 15.0 Hz and speed
50.0 m/s is traveling in deep water. It then
moves into shallow water where its speed is 40.0
m/s. The angle of incidence is 29°. Find
a) the index of refraction
b) the wavelengths in the two media
c) the angle of refraction in the shallow water
14. In your own words, explain this diagram:
15. What would change in the previous diagram if
they waves were closer together? Further apart?
5. 16. What conditions provide the greatest diffraction
when a wave passes through an opening?
17. IF you are hiding behind a tree during a game of
Marco Polo, whose voice is likely to diffract more
and why. Your low pitch (frequency) voice, or your
friends high pitched (frequency) voice and why.
18. What are the fundamental frequencies of the
following guitar strings when the speed of the
wave on the string is 200 m/s?
20 cm
40 cm
60 cm
19. The third overtone of a particular string occurs
at 400 Hz. What is the fundamental frequency of
this string? If the speed of the wave is 50 m/s,
what is the wavelength of the second overtone?
What is the length of the string being used?
20. Make a diagram showing the fourth harmonic of a
standing wave. Label all important parts
