9702_w22_qp_12
A paper of Physics, 9702
Questions:
40
Year:
2022
Paper:
1
Variant:
2
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3
A spring is suspended from a fixed point and a force is applied. The position of a pointer attached to the bottom of the spring against a vertical ruler is recorded. Before the force is applied, the position of the pointer is (225  2) mm. After the force is applied, the position of the pointer is (250  2) mm. The extension of the spring is determined. What is the percentage uncertainty in the extension?
1. Physical quantities and units  →  1.3. Errors and uncertainties
6. Deformation of solids  →  6.1. Stress and strain
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13
A box of length 12 cm and weight 0.43 N is placed on a horizontal table, with the greater part of its length overhanging the edge of the table. The edge of the table acts as a pivot. The centre of gravity of the box is at its geometric centre. To balance the box, a uniform sphere of diameter 2.4 cm is placed inside the box, touching one end, as shown...
4. Forces, density and pressure  →  4.2. Equilibrium of forces
13. Gravitational fields  →  13.2. Gravitational force between point masses
Open
19
An object of mass m is dropped onto the surface of two planets, X and Y, which have no atmosphere. The height from which the object is dropped and the change in gravitational potential energy of the object, for each planet, are given in the table. height / m change in gravitational potential energy planet X ∆E planet Y 4∆E The acceleration of free fall near the surface of planet X is gX. What is the acceleration of free fall near the surface of planet Y?
2. Kinematics  →  2.1. Equations of motion
13. Gravitational fields  →  13.3. Gravitational field of a point mass
3. Dynamics  →  3.1. Momentum and Newton’s laws of motion
Open
24
A miniature loudspeaker, initially at rest, falls vertically from a window in a high building. When the speaker has fallen a distance of 10.0 m, it emits a very short pulse of sound of constant frequency 256 Hz in all directions. The pulse of sound, travelling at a speed of 330 m s–1, is heard by a person leaning out of the window. Air resistance is negligible. What is the frequency of the pulse of sound heard by the person?
7. Waves  →  7.3. Doppler effect for sound waves
24. Medical physics  →  24.1. Production and use of ultrasound
Open
26
The wavelength of sound in air may be determined by using stationary waves. In one experiment, a loudspeaker produces a sound wave of constant frequency which is reflected directly back along its original path by a metal plate approximately 1 m away. A microphone connected to a cathode-ray oscilloscope (CRO) is moved between the loudspeaker and plate to identify regions of high sound intensity (‘loud’ spots) and low sound intensity (‘quiet’ spots). The wavelength of the sound is determined using the least possible number of measured quantities. Which row shows the quantities that are needed?
7. Waves  →  7.3. Doppler effect for sound waves
24. Medical physics  →  24.1. Production and use of ultrasound
Open
29
Light of a single frequency is incident on a pair of narrow slits that are a distance of 0.10 mm apart. A series of bright and dark fringes is observed on a screen a distance of 2.0 m away. The distance between adjacent bright fringes is 8.0 mm. light screen second-order dark fringe slits zero-order bright fringe distance between bright fringes = 8.0 mm 2.0 m NOT TO SCALE What is the path difference of the light waves from the two slits that meet at the second-order dark fringe?
8. Superposition  →  8.3. Interference
8. Superposition  →  8.2. Diffraction
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37
A potential divider circuit is designed to detect the difference in temperature between two different places. V X Y 20 mV The cell has electromotive force (e.m.f.) 20 mV and negligible internal resistance. Initially, thermistors X and Y are at the same temperature and have the same resistance. The voltmeter reads 10 mV. X is then placed in a cold environment and its resistance doubles. Y is placed in a warm environment and its resistance halves. What is the new reading on the voltmeter?
10. D.C. circuits  →  10.3. Potential dividers
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38
In the -particle scattering experiment, a beam of -particles is aimed at a thin gold foil. Most of the -particles go straight through or are deflected by a small angle. A very small proportion are deflected by more than 90, effectively rebounding towards the source of the -particles. Which conclusion about the structure of atoms cannot be drawn from this experiment alone?
11. Particle physics  →  11.1. Atoms, nuclei and radiation
22. Quantum physics  →  22.3. Wave-particle duality
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