Waves

PAGE

CHAPTER 6 : WAVE

SECTION A

SPM2003 Section A. No. 3 (6 Marks)1.Figure 4 shows an airport radar transmitting microwave signals. Microwaves are

transmitted to determine the position of aeroplanes.

(a) Microwaves are a type of _________________________________ waves. [ 1mark]

(b) The radar transmits at a signal at a velocity of 3.0 x 108 ms-1 towards the aeroplane P and detects the reflected signal 4.0 x 10-4 s later.

Calculate the distance of P from the radar transmitter at the time.

[3mark]

(c) The radar detects the same signal after reflection by another aeroplane, Q. The

signal from Q arrives later than the signal from P.

(i)Compare the distances of P and Q from the radar.

___________________________________________________________

[1 mark](ii)State how the difference of the distance of P and Q from the radar is determined at any time

___________________________________________________________

[1 mark]

SPM2004 Section A. No.6 (8 Marks)2.Diagram 1.1 shows the arrangement of apparatus in Youngs double slit experiment. A while light source is passed through a coloured filter to produce a monochromatic light. Diagram 1.2 shows the pattern of the fringe formed on the screen when a red filter is used.

The experiment is repeated by using a blue filter and the fringes formed are shown in Diagram 1.3

(a) What is meant by a monochromatic light?

________________________________________________________________[1 mark]

(b) Using the pattern of the fringes in Diagram 1.2 and 1.3, state two observations about the distances between consecutive fringes for the red light and blue light.

i) ______________________________________________________________

ii) ______________________________________________________________

[2 marks]

(c) Compare the wavelengths of red light to blue light.

________________________________________________________________

[1 mark]

(d) Compare the wavelengths of red light and blue light with the distances between consecutive fringes in (b).

____________________________________________________________

[1 mark]

(e) Name the wave phenomenon which forms the pattern of the fringes in Diagram 1.2 and 1.3.

_________________________________________________________________

[1 mark]

(f) A white light is used without the coloured filter and the double slit is replaced with a diffraction grating. A spectrum is formed on the screen as shown in Diagram 1.4.

Figure 6.4

Explain briefly how the spectrum is formed.

[2 marks]

SPM2005 Section A. No 2. (5 Marks)3.Two similar loudspeakers are placed 0.8m apart. They emit a coherent sound wave. A girl

walks slowly parallel to the two loudspeakers at a distance 3.2m in front of the loudspeakers. She hears a loud sound and weak sound alternately. Figure below shows the positions of the loud and weak sounds.

(a)What is meant by a coherent wave ?

_____________________________________________________________________

[1mark]

(b)The distance between three position of the loud sound is 4.5m, as shown in Figure above.

Calculate the wavelength of the sound wave.

[3marks]

(c) The loud sound is heard due to the constructive interference of the sound waves.

_____________________________________________________________________

[1mark]

SPM2006 Section A. No.3. (6 Marks)4Diagram 2 shows two loudspeakers connected to an audio frequency generator. Students are standing' at positions where loud sounds can be heard.

(a)What type of wave is the sound waves?

___________________________________________________________

[1 mark]

(b)Why are loud sounds heard by the students at that positions?

___________________________________________________________

[1 mark]

(c) The distance between the two loudspeakers is 1.5 m. At 10.0 m from the loudspeakers, the distance between two adjacent rows of students is 4.0 m.

Calculate the wave length of this sound wave.

[2 marks]

(d)The frequency of the sound wave is increased.

(i) What will happen to the distance between two adjacent rows where loud sounds are heard?

[1 mark]

(ii) Give a reason for your answer in 3(d)(i).

____________________________________________________________________

[1 mark]

SPM2007 Section A. No.1. (4 Marks)5.Diagram below shows how a vibrating tuning fork produces sound waves in air.

(a)Underline the correct answer in the bracket to complete he sentence below.

Sound wave is a (longitudinal, transverse) wave.

[1mark]

(b) Based on Diagram above ;

(i)name region X ?

____________________________________________________ [1mark]

(ii)mark one distance which is equal to a wavelength of the sound wave.

Label the distance using the symbol .

[1mark]

(c) The turning fork in Diagram above vibrates in water.

What happens to the speed of sound ?

__________________________________________________________ [1mark]

SPM2008 Section A. No.1. (4 Marks)6Diagram shows a slinky spring being moved left and right continuously.

a) Complete the sentence below by ticking (() the correct box.

The wave produced by the slinky spring is a

transverse wave

(longitudinal wave

(

[1 mark]

b)On Diagram below, mark X on any one of the crests of the wave.

[1 mark]

c)Complete the following sentence by underlining the correct phrase

in the bracket.

The direction of the hand movement isthe same as

opposite to

perpendicular to

the direction of the wave movement.

d) What is transferred by the wave ?

______________________________________________________

[ 1 mark]

Diagram 1.1

Diagram 1.4

Diagram 2

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