[SC F2] 10.3 Application of Reflection of Sound Waves

Which of the following uses the principle of reflection of sound?

• Sonar

• Hearing aid

• Loudspeaker

• Microscope

Tags

NGSS.MS-PS4-2

Which of the following is the hearing range of human?

• 16 Hz to 12 000 Hz

• 20 Hz to 20 000 Hz

• 55 Hz to 33 500 Hz

• 2 000 Hz to 110 000 Hz

Tags

NGSS.MS-LS1-8

Dolphins warn each other of the presence of predator using ultrasound. We cannot hear the ultrasound because

• the sound is too low.

• human can only hear sound of frequency range from 20 Hz to 20 000 Hz.

• the sound was absorbed by water.

• the sound produce multiple echo until our ears cannot capture it.

What is an echo?

• The vibrations of sound.

• The reflected sound waves.

• The changes of sound frequency.

• The sound waves which are absorbed.

Tags

NGSS.MS-PS4-2

Which of the following statements about ultrasound is true?

• Ultrasound can only be heard by human being.

• The frequency of sound waves more than 20 000 Hz.

• Ultrasound is similar to Doppler effect.

• Ultrasound has low frequency sound waves.

Tags

NGSS.HS-PS4-1

Which of the following animals detects direction by using ultrasound?

• Monkey

• Bat

• Jelly fish

• Chicken

What is the importance of sonar for submarine navigation?

• Helps in weather forecast.

• Helps the submarine to slow down its speed.

• Helps the submarine to move faster.

• Helps to detect object under the surface of water.

Tags

NGSS.MS-PS4-2

Which of the following is used to listen to the heartbeat of a patient?

• Stethoscope

• Microphone

• Microscope

• Hearing aid

Which of the following device was not invented to overcome the hearing limitation of human?

• Stethoscope

• Microphone

• Megaphone

• Periscope

Echo is a reflected sound that takes time to reach the ear of the listener. The phenomena of echo can be found in the following areas except

• cave

• tunnel

• empty room

• outdoor playground

Tags

NGSS.MS-PS4-2