Understanding Echoes and Ultrasound

What is an echo?

• A sound that is amplified by walls

• A sound that is reflected back to the source

• A sound that is absorbed by surfaces

• A sound that travels in a straight line

How do soft furnishings affect echoes?

• They amplify the sound waves

• They have no effect on echoes

• They reduce the effect of echoes

• They increase the effect of echoes

What is the formula to calculate the speed of sound using echoes?

• Speed = Time x Distance

• Speed = Time / Distance

• Speed = Distance / Time

• Speed = Distance x Time

In the example given, what is the total distance the sound travels to and from the building?

• 340 meters

• 680 meters

• 170 meters

• 510 meters

How can you calculate the distance to an object using echoes?

• Distance = Speed x Time

• Distance = Speed / Time

• Distance = Time x Speed

• Distance = Time / Speed

What is the frequency range of ultrasound?

• 20 Hz to 20,000 Hz

• Above 20,000 Hz

• 10,000 Hz to 20,000 Hz

• Below 20 Hz

How do bats use ultrasound?

• To communicate with other bats

• To navigate and find food

• To scare away predators

• To attract mates

What is echolocation?

• A technique for amplifying sound

• A way to reduce noise pollution

• A method of sound absorption

• A process of emitting and receiving sound waves

How do doctors use ultrasound?

• To measure blood pressure

• To form images of internal organs

• To diagnose hearing problems

• To treat muscle injuries

What is sonar used for?

• To measure water temperature

• To detect submarines

• To navigate ships

• To communicate with marine life