Name: ______Score: ______/32
Self assessment: Sound & reflection of light
The pictures below represent an open-ended pipe, closed-ended pipe, and a string respectively. For each drawing, sketch in the simplest possible standing wave that could exist.
1.
2.
3.
Here are two sound wave patterns.
= f. Use 345 m/s for the speed of sound and
calculate the following. Show your work.
4. ______frequency
5. ______wavelength
6. ______frequency
7. ______wavelength
8. Which sound is louder? Explain.
9. Which sound has a lower pitch? Explain.
10. What made the sounds for 4 - 7: a voice, a guitar, a tuning fork, a saxophone or
none ofthe above? Explain.
11. Something vibrating and causing something else to vibrate is known as…
12. Does sound travel faster in air or water? Explain.
13. Why does a middle C (or any note) sound different on a piano than on a viola?
14. ______An organ pipe, closed at one end, is .17 m long. If the speed of
sound is 345m/s, what fundamental frequency will be made in such a pipe? Remember that closed pipes make standing waves with a wavelength of 1/4.
15. ______An organ pipe, an open ended tube, has a length of 2.6m. What
frequency wouldbeproduced by this pipe if the speed of sound is 345 m/s? Remember that closed pipes make standing waves with a wavelength of 1/2.
16. Put a check mark by all of the statements that describe electromagnetic waves.
______need a medium to travel through
______can travel through a vacuum
______all travel at the same speed in a vacuum
______all have the same wavelength
______all have the same frequency
______all have the same amount of energy
17. The two most commonly used models describe light as a ______AND as
a______. Therefore light has a ______nature.
18. Albert Einstein hypothesize that light is composed of tiny, particle-like bundles of radiation called ______.
Match the type of electromagnetic radiation with the phrase that describes it.
19. ______Radio WavesA. kill cancerous cells
20. ______Infrared WavesB. can cause sunburn
21. ______Visible LightC. night vision goggles
22. ______Ultraviolet RaysD. scanning luggage in an airport
23. ______X-RaysE. cell phones
24. ______Gamma RaysF. cooking
25. ______MicrowavesG. photosynthesis, colors
26. Put the above waves in order fromshortestwavelength to longest wavelength
bynumbering them in the margin on the left. #1 should be the shortest wavelength.
Match: place only one letter in each blank. Letters may be used once, more than once
or not at all.
A.ReflectionB. RefractionC. Diffraction
27. ______When light bends as it meets boundaries/corners
28. ______Causes rainbows in the sky (as opposed to in bubbles, oil slicks, etc.)
29. ______When light bends as it goes from one medium to another
30. ______Caused by light waves changing speeds
31. ______Creates new waves that match the properties (speed, frequency,
amplitude, wavelength) of the old wave
32. ______Waves bounce off a surface
Name: __Answer Key__ Score: _32_/32
Self assessment: Sound & reflection of light
The pictures below represent an open-ended pipe, closed-ended pipe, and a string respectively. For each drawing, sketch in the simplest possible standing wave that could exist.
1.
2.
3.
Here are two sound wave patterns.
= f . Use 345 m/s for the speed of sound and
calculate the following. Show your work.
4. _480 Hz_ frequency (24 waves
in .05 sec)
5. _.72 m_ wavelength (345/480
= .71875)
6. _515 Hz_ frequency(10.3
waves in .020 sec)
7. _.67 m_ wavelength (345/515
= .669902912)
8. Which sound is louder? Explain.
Second one…higher amplitude
9. Which sound has a lower pitch? Explain.
First one…lower frequency (bigger wavelength)
10. What made these sounds: a voice, a guitar, a tuning fork, a saxophone or none of
the above? Explain.
Tuning fork…clear waves, no interference or
harmonics
11. Something vibrating and causing something else to vibrate is known as…
Resonance…causes other standing waves called
harmonics
12. Does sound travel faster in air or water? Explain.
Water…it’s more dense so the energy gets
passed from molecule to molecule faster.
13. Why does a middle C (or nay note) sound different on a piano than on a viola?
Harmonics…they are playing the same
fundamental frequency (note…middle C), but different parts of the instrument vibrate at other frequencies, too called harmonics
14. _510 Hz_ An organ pipe, closed at one end, is .17 m long. If the speed of
sound is 345 m/s, what fundamental frequency of will be made in such a pipe? Remember that closed pipes make standing waves with a wavelength of 1/4.
= f = .17 x 4
345 = f (.68) f = 507.3529412 Hz
15. _66 Hz_ An organ pipe, an open ended tube, has a length of2.6 m. What
frequency would be produced by this pipe if the speed of sound is 345 m/s? Remember that closed pipes make standing waves with a wavelength of 1/2.
= f = 2.6 x 2
345 = f (5.2)f = 66.34615385 Hz
16. Put a check mark by all of the statements that describe electromagnetic waves.
______need a medium to travel through
______ can travel through a vacuum
______ all travel at the same speed in a vacuum
______all have the same wavelength
______all have the same frequency
______all have the same amount of energy
17. The two most commonly used models describe light as a __wave__ AND as a
___particle___. Therefore light has a __dual__ nature.
18. Albert Einstein hypothesized that light is composed of tiny, particle-like bundles of radiation called __photons____.
Match the type of electromagnetic radiation with the phrase that describes it.
19. __E____ Radio WavesA. kill cancerous cells
20. __C____ Infrared WavesB. can cause sunburn
21. __G____ Visible LightC. night vision goggles
22. __B____ Ultraviolet RaysD. scanning luggage in an airport
23. __D____ X-RaysE. cell phones
24. __A____ Gamma RaysF. cooking
25. __F____ MicrowavesG. photosynthesis, colors
26. Put the above was in order fromshortest wavelength to longest wavelength by
numbering them in the margin. #1 should be the shortest wavelength.
Match: place only one letter in each blank. Letters may be used once, more than once
or not at all.
A.ReflectionB. RefractionC. Diffraction
27. ___C___When light bends as it meets boundaries/corners
28. ___B___Causes rainbows in the sky (as opposed to in bubbles, oil slicks, etc.)
29. ___B___When light bends as it goes from one medium to another
30. ___B___Caused by light waves changing speeds
31. ___C___Creates new waves that match the properties (speed, frequency,
amplitude, wavelength) of the old wave
32. ___A___ Waves bounce off a surface