# Introduction To Physical Science

## Chapter 17: Sound

### Section 1 Self-Check Quiz-Eng.

 1 Sounds are produced by __________. Need a Hint? A) pitch B) vibrations C) frequencies D) reverberations 2 What type of waves are sound waves? Need a Hint? A) compressional B) transverse C) radio D) sonar 3 The two types of regions that make up compressional waves are __________. Need a Hint? A) compressions and extensions B) compressions and rarefactions C) vibrations and transmissions D) compressions and transmissions 4 In which of the following mediums will sound travel fastest? Need a Hint? A) air B) water C) oil D) brick 5 How does temperature of a medium affect the speed of sound waves? Need a Hint? A) As the temperature of a substance increases, sound waves in it move faster. B) As the temperature of a substance decreases, sound waves in it move faster. C) As the temperature of a substance increases, sound waves in it move more slowly. D) Temperature does not affect the speed of sound waves. 6 The human perception of sound intensity is __________. Need a Hint? A) frequency B) loudness C) pitch D) acoustics 7 The intensity of sound is measured in units called __________. Need a Hint? A) hertz B) dopplers C) decibels D) reverberations 8 Which of the following will you hear as a high pitch? Need a Hint? A) sound wave with frequency of 50 Hz B) sound wave with intensity of 10 dB C) sound wave with frequency of 10,000 Hz D) sound wave with intensity of 100 dB 9 The change in pitch due to a moving wave source is called __________. Need a Hint? A) the Doppler effect B) a rarefaction C) the compressional effect D) resonance 10 The process of locating objects by emitting sounds and interpreting the reflected sound waves is __________. Need a Hint? A) sonar B) radar C) echolocation D) ultrasound 11 The amount of energy a wave carries depends on __________. Need a Hint? A) the amplitude of the wave B) the frequency of the wave C) the Doppler effect D) pitch 12 As frequency increases, wavelength __________. Need a Hint? A) decreases B) increases C) remains constant D) becomes faster 13 A reflected sound wave also is called __________. Need a Hint? A) noise B) a Doppler C) resonance D) an echo 14 __________ is a system that uses the reflection of underwater sound waves to detect objects. Need a Hint? A) Radar B) Echolocation C) Sonar D) The Doppler Effect 15 What is the less dense region of a compressional wave called? Need a Hint? A) trough B) rarefaction C) crest D) rest position 16 __________ occurs when waves bend around a barrier. Need a Hint? A) Diffraction B) Reflection C) Refraction D) Interference