REVIEW MATERIAL SOUND WAVE

What is required for sound to travel?

• Light

• Medium (solid, liquid, or gas)

• Water

• Electricity

What happens when sound waves travel through a vacuum?

• They travel faster

• They do not travel

• They bend

• They cause light

Which of these factors affects the speed of sound?

• The frequency of the sound

• The medium through which sound is traveling

• The pitch of the sound

• The intensity of the sound

Which of the following is an example of a useful echo?

• The sound heard when shouting in a tunnel

• The sonar used by ships to detect objects underwater

• The sound of a voice in an empty room

• The noise caused by loudspeakers in a concert hall

Where does sound travel the fastest?

• In air

• In water

• In a vacuum

• In steel

Which of the following is an example of an unwanted echo?

• The reflection of sound in a large auditorium

• The sonar used to locate fish

• Dolphins use echolocation to navigate and find food

• The sound used by bats for navigation

In sonar, what happens when sound waves hit an object like a fish?

• The sound waves continue traveling without any change

• The sound waves bounce back to the boat, helping detect the object

• The sound waves are absorbed by the fish

• The sound waves stop entirely

If the sound waves take 2 seconds to travel to the bottom and back, and the speed of sound in water is 1500 m/s, what is the depth of the water?

• 1500 meters

• 3000 meters

• 750 meters

• 1000 meters

What causes an echo?

• Sound waves bending around objects

• Sound waves reflecting off a surface

• Sound waves passing through air without bouncing

• Sound waves being absorbed by surfaces

Which of the following can be used to reduce unwanted echoes in a room?

• Adding reflective surfaces like mirrors

• Using soft materials like curtains or foam

• Increasing the volume of sound sources

• Making the room smaller