Physics for pre-IGCSE-Homework sheet "2"- Term 2

Paper!: chose the best answer:

1. A sound wave passes through the air, in the directionshown. How does a particle of air move as the sound wave dirpasses?

A. moves to the right and stays there

Ci) moves left and right

C. moves up and 'stays there r

D. moves up and down

2. A boy is stranded on an island 500 m from the shore.He shouts for help, but all he can hear in reply is theecho of his shout from some cliffs. Sound travels at340m! s through the air. What is the time intervalbetween the boy shouting and hearing the echo?

500. 340 s

2 500 c 340500 s®A o s

3. An engineer standing at P hears the sound of an explosionat X. After the explosion, she hears two bangs. One bangis heard a fraction of a second after the other. The secondbang is an echo fromA. XY.B. PV.

@ZY.D. WX.

o 2 34000 s

4. A fire alarm is not loud enough. An engineer adjusts it so that it produces a note of the same pitch which is louder.What effect does this have on the amplitude and on the frequency of the sound?

amplitude frequency

A larger larger

IG) larger same

C same larger

0 same same

=

Physics for pre-IGCSE-Homework sheet "2"- Term 2

s. To estimate the width of a valley, a climber starts astopwatch as he shouts. He hears an echo from theopposite side of the valley after 1.0 s. The sound travelsat 340 m / s. What is the width of the valley?A. 85 m 4. . \ sB 170 m ec.~l0 \.\~ -= -ec,C. 340 m -;V ,~t~V\G.. ~ V t

'2..:5\,,(0 YT'

D. 680 m w;J tVi = I\..( 0 7- \ ,:/-0 rn2.

6. The diagram shows.a man standing at X who shouts to a man standing atY. The man's voice will be heard sooner and more clearly if the wind isblowing towards theA. north.

south.C. East.D. west.

volle

N

c()::Jy

7. Sounds are made by vibrating objects. A certain object vibrates but a person nearby cannot hear any sound. Whichstatement might explain why nothing is heard?A. The amplitude of the sound waves is too large.

@) The frequency of the vibration is too high. ( 20000 H-c)C. The sound waves are transverse.D. The speed of the sound waves is too high.

8. Music is produced by the loudspeaker of a radio. Which property of the sound wave increases when the music ismade louder?

amplitudeB. frequencyC. speedD. Wavelength Om

9. A starting pistol is fired 640 m away from aspectator. The spectator hears the sound of thestarting pistol two seconds after seeing theflash from the gun. What is the speed of soundin air?A. 160 m / s

® 320 m/sC. 640 m / sD. 1280 m / s

'."

~

speclalor

10. Which equation can be used to calculate the speed of sound?(6:: Speed = distance/timeB. Speed = distance x timeC. Speed = time / distanceD. Speed = time + distance