# Units 11 and 12 Review

Waves, Light and Sound

 Navigate to Answers for: [ Questions #1-#14 | Questions #15-#28 | Questions #29-#42 | Questions #43-#56 | Questions #57-#68 ] [ #43 | #44 | #45 | #46 | #47 | #48 | #49 | #50 | #51 | #52 | #53 | #54 | #55 | #56 ]

43. A vibrating object is necessary for the production of sound.

 a. True b. False

Sound is a Mechanical Wave (13 seconds)

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44. Sound is transmitted through the air by means of transverse waves

 a. True b. False

Sound is a Longitudinal Wave (9 seconds)

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45. On a warm day, the speed of sound in air is greater than on a cool day

 a. True b. False

The Speed of Sound (6 seconds)

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46. A sound wave has a wavelength of 3.0 m. The distance between the center of a compression and the center of the adjacent refraction is

 a. 0.75 m. b. 1.5 m. c. 3.0 m. d. 6.0 m. e. impossible to calculate without knowing frequency.

Sound is a Pressure Wave (12 seconds)

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47. Which one of the following CANNOT transmit sound?

 a. liquid air. b. gaseous oxygen. c. liquid water. d. solid steel. e. perfect vacuum.

Sound is a Mechanical Wave (13 seconds)

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48. Which one of the following factors determines the pitch of a sound?

a. the amplitude of the sound wave.

b. the distance of the sound wave from the source.

c. the frequency of the sound wave.

d. the phase of different parts of the sound wave.

e. the speed of the sound wave.

Pitch and Frequency (7 seconds)

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49. A certain note is produced when a person blows air into an organ pipe. If the person blows slightly harder, the most probable change will be that the sound wave will increase in

 a. amplitude. b. frequency. c. pitch. d. speed. e. wavelength.

Intensity and the Decibel Scale (5 seconds)

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50. A girl moves away from a source of sound at a constant speed. Compared to the frequency of the sound wave produced by the source, the frequency of the sound wave heard by the girl is

 a. lower. b. higher. c. the same.

The Doppler Effect and Shock Waves (9 seconds)

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51. If the electromagnetic waves received on earth from a source in outer space appear to be increasing in frequency, the distance between the source and the earth is probably

 a. decreasing. b. increasing. c. remaining the same.

The Doppler Effect and Shock Waves (9 seconds)

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52. The increase in amplitude of a vibrating object, due to periodic impulses of the same frequency as the natural frequency of the vibrating object, is called

 a. beats. b. fundamental. c. interference. d. overtone. e. resonance.

Resonance (9 seconds)

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53. A tuning fork, producing sound waves of wavelength W, causes resonance in a closed air column. The length of the air column could NOT be

 a. 1/4 W b. 2/4 W c. 3/4 W d. 5/4 W e. 7/4 W

Closed-End Air Columns (21 seconds)

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54. One vibrating body can set another body into vibration if the natural frequencies of the two bodies are the same.

 a. True b. False

Resonance (9 seconds)

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55. If a source of sound of wavelength W is held near any air column (open or closed), the difference between the successive lengths of the air column at which resonance will occur is 1/2 W.

 a. True b. False

Open-End Air Columns (21 seconds) | Closed-End Air Columns (21 seconds)

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56. An organ pipe closed at one end will resonate if its length is equal to half of the wavelength of the sound in the pipe.

 a. True b. False

Closed-End Air Columns (21 seconds)

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