Heat, Light, and Sound

1. Heat, Light, and Sound Review and Study Guide

2. Which of the these might damage hearing? A Jet plane taking off (160 decibels) or a chain saw (110 decibels)

3. Which of the following would be annoying but not damaging to hearing? A hair dryer (90 decibels) and a ringing telephone (80 decibels)

4. Heather put a straw in a glass of water. When she looked at the side of the glass she observed that the straw appeared larger and also appeared to be broke. Why did it appear this way? When the light hit the glass of water It refracted

5. How could a guitar be made to make a louder sound? Pluck the strings harder, with more energy! ~~~~~~~~~~~~~

6. What is the angle of reflection of trial “One”? The angle of reflection would be 10 degrees.

7. What is the angle of incidence of trial “Two?” The angle of incidence would be 45 degrees.

8. What would you do to lower the pitch of a string on a violin? • You would loosen the strings. • Never cut the strings! ;)

9. If you were arranging the tubes below to play a tune, which one would make the lowest pitch? Tube A (think flute vspiccalo)

10. What happens if you increase the frequency of a sound? • The sound will get higher. • Frequency refers to the speed with which a sound is vibrating, faster means higher pitch, slower frequency means lower pitch.

11. What would happen if you increased the intensity of a sound? • The sound would get louder!

12. What causes an echo? Sound waves are Reflected Or bounced --- ---off an object.

13. What is the best activity to help keep a home cool in the summer? • A- Open the refrigerator often. • B -Close the shade where the sun is shining. • C- Open the windows during the day. • D- Turn off the television, radios, and computers. B- Close the shade where the sun is shining!

14. What happens to the light particle when light his an uneven surface? • A- They are scattered in many directions. • B- They pass through the surface. • C- They are absorbed by the surface. • D- They are reflected off in a straight line. A. They are scattered in many directions.

15. Which of the following is an example of a reflector? • A- Stars • B- Lightening • C- The planet Mars • D- Exploding Fireworks C. Mars (Not to mention the Moon!)

16. What happens to a sound as the vibrations of an object increase in strength? • A- The pitch of a sound is higher. • B- The sound becomes softer • C- The sound waves get further apart. • D- The sound becomes louder. D- The sound becomes louder.

17. Nate was stirring hot soup on the stove. Why should he use a wooden spoon instead of a metal spoon? • A- Wood conducts heat very well and metal does not. • B- It doesn’t matter which spoon he uses. • C- Wooden spoons cost less. • D- Metal conducts heat very well and wood does not. D- Metal conducts heat very well and wood does not.

19. Explain the difference between a light producer and a light reflector. • A- A light producer bends light and a light reflector breaks light • B- A light producer sends light and a light reflector stops light back • C- A light producer makes light and an light reflector bounces light back. • D- A light producer bounces light back and a light reflector creates light C- A light producer makes light and an light reflector bounces light back.

20. What material is a good example of transparency? • A- Glass • B- Foil • C- Moon • D- Wax paper A- Glass

21. What would you do to increase the intensity of the sound that a drum makes? • A- Make the drum head out of thicker material. • B- Loosen the drum head. • C- Tap the drum head harder. • D- Tighten the drum head. C- Tap the drum head harder.

22. Which of the following is an example of a light producer? • A- The moon • B- A campfire • C- A concave mirror • D- A red shirt. B- A campfire

23. What makes a hot air balloon rise? The particles of air in the balloon __ • A- are closer together and make the balloon lighter than air. • B- are farther apart and make the balloon lighter than air. • C- increase in size and make the balloon lighter than air. • D- decrease in size and make the balloon lighter than air. B- are farther apart and make the balloon lighter than air.

24. Which of the following is an example of heat conduction? • A- Cool air sinking to the ground on a cold night • B- The sun melting the ice formed on a frosty lawn. • C- A metal cup heating up when hot water is poured into it. • D- An air vent from a furnace sending hot air into the house. C- A metal cup heating up when hot water is poured into it.

25. In a room in the wintertime, where would you find the warmest air? • A- Near the ceiling • B- Near the floor • C- in the corners • D- By a window A- Near the ceiling

26. Why do you see your image in a mirror? • A- Light is diffused • B- Light is absorbed • C- Light is refracted • D- light is reflected D- light is reflected

27. Why is wax paper classified as translucent? • A- it allows heat to pass through it • B- it allows some light to pass through it • C- it allows some sound to pass through it • D- it allows no light to pass through it B- it allows some light to pass through it

28. Any Questions? The answer is, “Yes, you should study for the test

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