CHAPTER 6 SOUND

What are the characteristics of sound?

(Choose 3 correct answers)

• sound is produced when somethings is vibrates

• sound can be reflected

• sound cannot be reflected under the water

• sound can travels to all directions

______ can produce sound.

(write your answer in small letters)

sound can travel to all ______.

(write your answer in small letters)

Which of the following are the phenomenons of the sound reflection?

• sound absorbers absorb sound

• echo

• sonar

• ultrasonic scan

What is the function of sonar?

• determine the distance of an airplane

• enables examination of internal organs

• to measure the depth of an ocean

• detect the location of prey

Ultrasound can be heard by human.

• True

• False

Sound can allow us to feel calm and pleasant.

• True

• False

How can be protect our ears?

• Use ear protectors

• Increase the volume of televisions

• Shout beside your friend's ear

• Always on the music loud

Sound can be produced through_____?

(Choose 2 correct answers)

• knocking

• plucking

• dancing

• jumping