Question

1. material vibrations through which a wave travels

a) sound
b) medium
c) doppler effect
d) pitch

1. mechanical waves usually travel fastest through

a) gases
b) solids
c) liquids
8.
which of these waves has the highest frequency?
a) 2
b) 3
c) 1

1. a reflected sound wave

a) frequency
b) pitch
c) echo
d) rarefaction

1. a medium is...

a) a substance that transmits waves.
b) the movement of material in front of a sound wave
c) a requirement for transmission of light waves.
d) the density of air in a particular setting.

1. which medium will transmit sound the fastest?

a) solid iron
b) perfumed air
c) a sponge
d) ocean water
12.
wave 1
wave 2
wave 3
which of the following sound waves represents a dolphins loud and high pitched whistle.
a) wave 1
b) wave 2
c) wave 3
13.
wave 1
wave 2
wave 3
which of the following sound waves represents an angry dogs low pitched and loud growl (baritone)?
a) wave 3
b) wave 2
c) wave 1

Explanation:

1. Doppler effect describes frequency shift of waves from moving sources.
2. Mechanical waves travel fastest in solids due to close particles.
3. Frequency = number of waves; Wave 1 has most cycles.
4. Reflected sound waves keep frequency unchanged.
5. Medium is a substance that carries waves.
6. Solid steel has tightly packed particles, fastest sound transmission.
7. Loud = large amplitude; high-pitched = high frequency (Wave 3).
8. Low-pitched = low frequency; loud = large amplitude (Wave 2).

Answer:

1. c) Doppler Effect
2. b) solids
3. c) 1
4. a) frequency
5. a) a substance that transmits waves.
6. a) solid steel
7. c) Wave 3
8. b) Wave 2