properties of waves - sound

Question 1

sound is a _______ wave travelling in a medium, created by a vibrating source

Answer 1

longitudinal

Question 2

can sound travel through a vacuum?

Answer 2

no

Question 3

the higher the _______, the higher the ________

Answer 3

frequency, pitch

Question 4

the larger the________, the _______ the sound

Answer 4

amplitude, larger

Question 5

what is an echo?

Answer 5

it is the repetition of a sound due to the reflection of sound

Question 6

when ultrasound is used by fishing boats, an ultrasonic pulse is emitted into the water and the _______ pulse is obtained. the strength of the pulses depend on the _______ and _________ of the reflecting objects

Answer 6

reflected, distance, characteristics

Question 7

ultrasound is used by fishing boats to?

Answer 7

detect the location of fish and measure the depth of the sea

Question 8

why would a reflected pulse be smaller than the original pulse?

Answer 8

the pulse is likely to spread out as it passes through the water, and the reflected pulse is likely to be in a range of directions as well.