MCQ-7 Physics – Cambridge AS Level: Superposition
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Question 1 of 20
1. Question1 point(s)
A stationary wave of frequency 80.0 Hz is set up on a stretched string of length 210 cm.
What is the speed of the waves that produce this stationary wave?CorrectIncorrect
v= f * lambda
Question 2 of 20
2. Question1 point(s)
Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a. The separation of the fringes is x.
Both a and D are now doubled. What is the new fringe separation?CorrectIncorrect
Question 3 of 20
3. Question1 point(s)
Diagram 1 shows a ripple tank experiment in which plane waves are diffracted through a narrow slit in a metal sheet.
Diagram 2 shows the same tank with a slit of greater width.
In each case, the pattern of the waves incident on the slit and the emergent pattern are shown.
Which action would cause the waves in diagram 1 to be diffracted less and so produce an emergent pattern closer to that shown in diagram 2?CorrectIncorrect
v= f * lambda
Question 4 of 20
4. Question1 point(s)
The diagram shows a steel wire clamped at one end and tensioned at the other by a weight hung over a pulley.
A vibration generator is attached to the wire near the clamped end. A stationary wave with one loop is produced. The frequency of the vibration generator is f.
Which frequency should be used to produce a stationary wave with two loops?CorrectIncorrect
Length of wire = lambda/2
Question 5 of 20
5. Question1 point(s)
The basic principle of note production in a horn is to set up a stationary wave in an air column.
For the lowest note produced by a horn, a node is formed at the mouthpiece and the antinode is formed at the bell. The frequency of this note is 75 Hz.
What are the frequencies of the next two higher notes for this air column?
first higher note/Hz second higher note/Hz A 113 150 B 150 225 C 150 300 D 225 375CorrectIncorrect
Node has to be formed at mouthpiece and antinode has to be formed at the end of the horn
Question 6 of 20
6. Question1 point(s)
Which electromagnetic wave phenomenon is needed to explain the spectrum produced when white light falls on a diffraction grating?CorrectIncorrect
There are light slits and dark slits
Question 7 of 20
7. Question1 point(s)
A diffraction grating with 500 lines per mm is used to observe diffraction of monochromatic light of wavelength 600 nm.
The light is passed through a narrow slit and the grating is placed so that its lines are parallel to the slit. Light passes through the slit and then the grating.
An observer views the slit through the grating at different angles, moving his head from X parallel to the grating, through Y, opposite the slit, to Z parallel to the grating on the opposite side.
How many images of the slit does he see?CorrectIncorrect
For diffraction grating: d sinθ = nλ
Question 8 of 20
8. Question1 point(s)
In which situation does diffraction occur?CorrectIncorrect
Diffraction occurs when a wave encounters an obstacle or opening.
Question 9 of 20
9. Question1 point(s)
The diagrams show the arrangement of apparatus for a Young’s slits experiment and also part of the pattern formed on the screen with a ruler placed next to it.
What is the wavelength of the light?CorrectIncorrect
x = λD /a
Question 10 of 20
10. Question1 point(s)
To produce a stationary wave, two waves must travel in opposite directions through the same space.
Which statement about the properties of the two waves must also be true?CorrectIncorrect
Standing wave each have the same amplitude
Question 11 of 20
11. Question1 point(s)
A diffraction grating is used to measure the wavelength of monochromatic light, as shown in the diagram.
The spacing of the slits in the grating is 1.00 × 10–6 m. The angle between the first order diffraction maxima is 70.0 °.
What is the wavelength of the light?CorrectIncorrect
Angle of first order maxima needs to be halved
Question 12 of 20
12. Question1 point(s)
A monochromatic plane wave of speed c and wavelength λ is diffracted at a small aperture. The diagram illustrates successive wavefronts.
After what time will some portion of the wavefront XY reach point P?CorrectIncorrect
The distance between the 2 successive lines (wavefronts) is λ. This is for both the straight and curved lines.
Question 13 of 20
13. Question1 point(s)
A standing sound wave is set up between a loudspeaker and a wall.
A microphone is connected to a cathode-ray oscilloscope (c.r.o.) and is moved along a line directly between the loudspeaker and the wall. The amplitude of the trace on the c.r.o. rises to a maximum at a position X, falls to a minimum and then rises once again to a maximum at a position Y.
The distance between X and Y is 33 cm. The speed of sound in air is 330 ms–1.
Which diagram represents the c.r.o. trace of the sound received at X?
Distance between 2 antinodes = λ / 2 = 0.33 m
Wavelength λ = 2 × 0.33 = 0.66 m
Question 14 of 20
14. Question1 point(s)
Light of wavelength 600 nm is incident on a pair of slits. Fringes with a spacing of 4.0 mm are formed on a screen.
What will be the fringe spacing when the wavelength of the light is changed to 400 nm and the separation of the slits is doubled?CorrectIncorrect
For double slits: Separation of slits, a = Dλ / w
Question 15 of 20
15. Question1 point(s)
The speed of a transverse wave on a stretched string can be changed by adjusting the tension of the string. A stationary wave pattern is set up on a stretched string using an oscillator set at a frequency of 650 Hz.
How must the wave be changed to maintain the same stationary wave pattern if the applied frequency is increased to 750 Hz?CorrectIncorrect
Speed of wave, v = fλ
Question 16 of 20
16. Question1 point(s)
Noise reduction headphones actively produce their own sound waves in order to cancel out external sound waves.
A microphone in the headphones receives waves of one frequency. A loudspeaker in the headphones then produces a wave of that frequency but of a different phase.
What is the phase difference between the external sound wave and the wave produced by the loudspeaker in the headphones?CorrectIncorrect
The noise can be cancel out by destructive interference (using the principle of superposition
Question 17 of 20
17. Question1 point(s)
A transmitter of electromagnetic waves is placed 45 cm from a reflective surface.
The emitted waves have a frequency of 1.00 GHz. A stationary wave is produced with a node at the transmitter and a node at the surface.
How many antinodes are in the space between the transmitter and the surface?CorrectIncorrect
Speed of wave, v = fλ
Question 18 of 20
18. Question1 point(s)
A teacher sets up the apparatus shown to demonstrate a two-slit interference pattern on the screen.
Which change to the apparatus will increase the fringe spacing?CorrectIncorrect
For a double slit interference experiment: q sinθ = nλ
Question 19 of 20
19. Question1 point(s)
Monochromatic light of wavelength 5.30 × 10–7 m is incident normally on a diffraction grating. The first order maximum is observed at an angle of 15.4° to the direction of the incident light.
What is the angle between the first and second order diffraction maxima?CorrectIncorrect
Diffraction grating: d sinθn = nλ
Question 20 of 20
20. Question1 point(s)
A stationary wave on a stretched string is set up between two points P and T.
Which statement about the wave is correct?CorrectIncorrect
The waves are said to be in phase when corresponding points reach maximum or minimum displacements simultaneously.