physics chapter 14

Question 1

what is sound

Answer 1

sound is a form of energy that is transferred from one point to another

Question 2

how is sound produced

Answer 2

sound is produced by vibrating sources placed in a medium

Question 3

what is compression

Answer 3

compression is a region of space with high density, a place where molecules are bunched together

Question 4

what is rarefaction

Answer 4

rarefaction is a region of space with low density, a place where molecules are spread apart

Question 5

what is an infrasound

Answer 5

humans cannot hear low frequency sounds called infrasound. a vibrating ruler can be seen but not heard

Question 5

what is the range that a human ear can hear ( limits of audibility)

Answer 5

20 Hz to 20000Hz

Question 5

what is an ultrasound

Answer 5

humans cannot hear high frequency sounds called ultrasound. we cannot hear a dog whistle

Question 6

what is an echo

Answer 6

an echo is a reflection of sound waves

Question 7

what is an ultrasound

Answer 7

ultrasound is sound with a frequency higher than 20000Hz

Question 7

what are the uses of ultrasound

Answer 7

• testing materials for quality control
• medical scanning
• sonar

Question 7

what affects the loudness of the sound

Answer 7

loudness is related to the amplitude of a sound wave, the larger the amplitude, the louder the sound

Question 8

what affects the pitch of a sound

Answer 8

pitch is related to the frequency of the sound wave the higher the frequency, the higher the pitch