What I Know

Direction Choose the letter of the BEST answer. Write your answer on your activity notebook

1. The method of detecting the presence, position and direction of motion of distant
objects by reflecting a beam of sound waves is known as

B.SONAR

A RADAR C. MIR

D.CRO

2. When a wave travels through a medium A particles are transferred from one place to another

B. energy is transferred in a periodic manner C energy is transferred at a constant speed D none of the above statements is applicable

3. When sound travels through air, the air particles A vibrate along the direction of wave propagation

D. do not vibrate

4. Which of the following quantities tells how hot or cold an object is with respect to

some standard?

A Density

C. Pressure

B. Mass

D. Temperature

5. In which of the following water temperature will the movement of particles be fastest?

A 30°C of water

C. 70°C of water

B. 50°C of water D. 90°C of water

6. How would you relate the temperature of the medium with the speed of sound? A. The higher the temperature, the faster the sound travels

B. The higher the temperature, the slower the sounds travel

C. The lower the temperature, the faster the sound travels.

D. none of the above

7. What is the speed of the sound in air of 25° C temperatures?

A. 336ms

B.325m/s

D.355m/s

C.346m/s

8. Calculate the speed of sound if the temperature of the vibrating water is A.346m/s

C. 350m/s

B.347.8m/s

9. An echa occurs when sound

5.349.1ms

A is transmitted through a surface.

Bis reflected from a distant surface:

C changes speed when it strikes a distant surface. D. all of the above

10 The change in direction of a sound wave around corners is called

A diffraction

B. interference

C. refraction

D. reflection

28°C?

nasa picture​