PhysicsAndMathsTutor.
com
26 A sound wave is set up in a long tube, closed at one end. The length of the tube is adjusted until
the sound from the tube is loudest. 9702/01/M/J/05
What is the nature of the sound wave in the tube?
A longitudinal and progressive
B longitudinal and stationary
C transverse and progressive
D transverse and stationary
28 A teacher sets up the apparatus shown to demonstrate a two-slit interference pattern on the
screen. 9702/01/M/J/05
double screen
single
slit
slit
source
of light q
p r
Which change to the apparatus will increase the fringe spacing?
A decreasing the distance p
B decreasing the distance q
C decreasing the distance r
D decreasing the wavelength of the light
29 A parallel beam of white light is incident normally on a diffraction grating. It is noted that the
second-order and third-order spectra partially overlap. 9702/01/M/J/05
Which wavelength in the third-order spectrum appears at the same angle as the wavelength of
600 nm in the second-order spectrum?
A 300 nm B 400 nm C 600 nm D 900 nm
28 Light of wavelength 700 nm is incident on a pair of slits, forming fringes 3.0 mm apart on a screen.
What is the fringe spacing when light of wavelength 350 nm is used and the slit separation is
doubled? 9702/01/O/N/05
A 0.75 mm B 1.5 mm C 3.0 mm D 6.0 mm
Superposition
PhysicsAndMathsTutor.com
26 The graph represents a standing wave at two different times. 9702/01/O/N/05
displacement
X Y
distance along
the wave
What does the distance XY represent?
A half the amplitude
B half the frequency
C half the period
D half the wavelength
27 In which situation does diffraction occur? 9702/01/O/N/05
A A wave bounces back from a surface.
B A wave passes from one medium into another.
C A wave passes through an aperture.
D Waves from two identical sources are superposed.
26 Where, in a standing wave, do the vibrations of the medium occur? 9702/01/M/J/06
A only at the nodes
B only at the antinodes
C at all points between the nodes
D at all points between the antinodes
27 Monochromatic light is incident on a diffraction grating and a diffraction pattern is observed.
Which line of the table gives the effect of replacing the grating with one that has more lines per
metre? 9702/01/M/J/06
number of orders of angle between first and
diffraction visible second orders of diffraction
A decreases decreases
B decreases increases
C increases decreases
D increases increases
Superposition
PhysicsAndMathsTutor.com
28 A double-slit interference experiment is set up as shown. 9702/01/M/J/06
*
red
light
source
single double screen
slit slit
not to scale
Fringes are formed on the screen. The distance between successive bright fringes is found to be
4 mm.
Two changes are then made to the experimental arrangement. The double slit is replaced by
another double slit which has half the spacing. The screen is moved so that its distance from the
double slit is twice as great.
What is now the distance between successive bright fringes?
A 1 mm B 4 mm C 8 mm D 16 mm
26 Continuous water waves are diffracted through a gap in a barrier in a ripple tank. 9702/01/O/N/06
Which change will cause the diffraction of the waves to increase?
A increasing the frequency of the waves
B increasing the width of the gap
C reducing the wavelength of the waves
D reducing the width of the gap
27 The interference patterns from a diffraction grating and a double slit are compared. 9702/01/O/N/06
Using the diffraction grating, yellow light of the first order is seen at 30° to the normal to the
grating.
The same light produces interference fringes on a screen 1.0 m from the double slit. The slit
separation is 500 times greater than the line spacing of the grating.
What is the fringe separation on the screen?
A 2.5 × 10–7 m
B 1.0 × 10–5 m
C 1.0 × 10–3 m
D 1.0 × 10–1 m
Superposition
PhysicsAndMathsTutor.com
28 What may be used to produce stationary waves? 9702/01/O/N/06
A blowing air over the top of an empty bottle
B making a loud sound near a mountain
C passing monochromatic light through a double slit
D passing water waves through a narrow slit
25 The diagram represents a stationary wave on a stretched string. 9702/01/M/J/07
What is represented by point P and by the length x?
point P length x
A antinode one wavelength
B antinode two wavelengths
C node one wavelength
D node two wavelengths
26 A two-slit arrangement is set up to produce interference fringes on a screen. The fringes are too
close together for convenient observation when a monochromatic source of violet light is used.
9702/01/M/J/07
In which way would it be possible to increase the separation of the fringes?
A Decrease the distance between the screen and the slits.
B Increase the distance between the two slits.
C Increase the width of each slit.
D Use a monochromatic source of red light.
24 Monochromatic light illuminates two narrow parallel slits. The interference pattern which results is
observed on a screen some distance beyond the slits. 9702/01/O/N/07
Which change increases the separation between the dark lines of the interference pattern?
A decreasing the distance between the screen and the slits
B increasing the distance between the slits
C using monochromatic light of higher frequency
D using monochromatic light of longer wavelength
Superposition
