Physics 2024 May/June | Past Paper

Q1(a)

Short Answer 1 mark

Define the radian.

Q1(b)

MCQ 1 mark

A circular metal disc spins horizontally about a vertical axis, as shown in Fig. 1.1. 9.3 cm 1.2 cm rotation axis modelling clay metal disc Fig. 1.1 (not to scale) A piece of modelling clay is attached to the disc. For the instant when the piece of modelling clay is in the position shown, draw on Fig. 1.1:

A

circular metal disc spins horizontally about a vertical axis, as shown in Fig. 1.1.

A

piece of modelling clay is attached to the disc.

Q1(i)

Short Answer 1 mark

an arrow, labelled V, showing the direction of the velocity of the modelling clay

Q1(ii)

Short Answer 1 mark

an arrow, labelled A, showing the direction of the acceleration of the modelling clay.

Q1(c)

Short Answer 1 mark

The metal disc in Fig. 1.1 has a radius of 9.3 cm. The centre of gravity of the modelling clay is 1.2 cm from the rim of the disc and moves with a speed of 0.68 m s

Q1(i)

Short Answer 1 mark

Calculate the angular speed ω of the disc. ω = rad s [2] * 0019655342204 *

Q1(ii)

Short Answer 2 marks

Calculate the acceleration a of the centre of gravity of the modelling clay . a = m s

Q1(d)

Short Answer 1 mark

A second piece of modelling clay is attached to the disc in the position shown in Fig. 1.2. first piece of modelling clay second piece of modelling clay The second piece of modelling clay has a larger mass than the first piece. By placing one tick (3) in each row , complete Table 1.1 to show how the quantities indicated compare for the two pieces of modelling clay. Table 1.1 quantity less for second piece than first piece same for both pieces greater for second piece than first piece angular speed linear speed acceleration [3] [Total: 10] * 0019655342205 *

Q2(a)

Short Answer 1 mark

With reference to thermal energy , state what is meant by two objects being in thermal equilibrium.

Q2(b)

Short Answer 1 mark

Two cylinders X and Y each contain a sample of an ideal gas. The samples are in thermal equilibrium with each other. X has a volume of 0.0260 m and contains 0.740 mol of gas at a pressure of 1.20 × 10 Pa. Y has a volume of 0.0430 m and contains gas at a pressure of 2.90 × 10 Pa. Data for the two cylinders are shown in Fig. 2.1. 0.740 mol 1.20 × 10 0.0260 m 2.90 × 10 0.0430 m

Q2(i)

Short Answer 3 marks

Show that the temperature of the gas in X is 234 °C.

Q2(ii)

Short Answer 1 mark

Determine the number N of molecules of the gas in Y. Explain your reasoning. N = [3] * 0019655342206 *

Q2(iii)

Short Answer 1 mark

The gas in X consists of molecules that each have a mass that is four times the mass of a molecule of the gas in Y. Explain how the root-mean-square (r .m.s.) speed of the molecules in X compares with the r.m.s. speed of the molecules in Y. [Total: 10] * 0019655342207 * BLANK PAGE * 0019655342208 *, ,

Q3(a)

Short Answer 1 mark

State what is meant by the internal energy of a system.

Q3(b)

Short Answer 1 mark

With reference to molecular kinetic and potential energies, describe and ex plain how the internal energy of the system changes when:

Q3(i)

Short Answer 1 mark

a gas is heated at constant volume so that its temperature increases

Q3(ii)

Short Answer 1 mark

a wire is stretched within its elastic limit at constant temperature. [Total: 8] * 0019655342209 *

Q4

Short Answer 1 mark

A block of mass m oscillates vertically on a spring, as shown in Fig. 4.1. oscillations spring block equilibrium position The acceleration a of the block varies with displacement x from its equilibrium position, as shown in Fig. 4.2.±2A ±Y±2Y Y0 2Y 3Y±3Y The amplitude of the oscillations is 3Y and the maximum acceleration is 2A.

Q4(a)

Short Answer 1 mark

Explain how Fig. 4.2 shows that the oscillations of the block are simple harmonic.

Q4(b)

Short Answer 1 mark

Deduce expressions, in terms of some or all of m, A and Y, for:

Q4(i)

Short Answer 1 mark

the angular frequency ω of the oscillations ω =

Q4(ii)

Short Answer 2 marks

the maximum speed v of the oscillations =

Q4(iii)

Short Answer 2 marks

the energy E of the oscillations. E =

Q4(c)

Short Answer 1 mark

The period of the oscillations is 0.75 s and the value of 3Y is 1.8 cm. Determine an expression for x in terms of time t, where x is in cm and t is in seconds. x = [2] [Total: 9] * 0019655342211 *

Q5(a)

Short Answer 1 mark

Define electric potential at a point.

Q5(b)

Short Answer 3 marks

Two isolated charged metal spheres X and Y are near to each other in a vacuum. The centres of the spheres are 1.2 m apart, as shown in Fig. 5.1. 1.2 mX Y Fig. 5.1 (not to scale) Point P is on the line joining the centres of spheres X and Y and is at a variable distance x from the centre of X. Fig. 5.2 shows the variation with x of the total electric potential V due to the two spheres. 0.2 0.4 0.6 0.8 1.0 1.2 x / m Fig. 5.2 * 0019655342212 * State three conclusions that may be drawn about the spheres from Fig. 5.2. The conclusions may be qualitative or quantitative. 1 2 3

Q5(c)

Short Answer 1 mark

A proton is held at rest on the line joining the centres of the spheres in

Q5(c)(b)

Short Answer 1 mark

at the position where x = 0.60 m. The proton is released. Describe and explain, without calculation, the subseq uent motion of the proton. [Total: 7] * 0019655342313 *

Q6(a)

Short Answer 3 marks

Two capacitors X and Y are connected in series to a power supply of voltage V, as shown in Fig. 6.1.X Y The capacitance of X is C and the capacitance of Y is C Derive an expression, in terms of C and C , for the combined capacitance C of the capacitors in this circuit. Explain your reasoning.

Q6(b)

Short Answer 1 mark

Two capacitors P and Q are connected in parallel to a power supply of voltage V. The capacitance of P is 200 μF. The capacitance C of Q can be varied between 0 and 400 μF. When C = 0, the total energy stored in the capacitors is 2.5 mJ.

Q6(i)

Short Answer 1 mark

Show that the supply voltage V is 5.0 V. [2] * 0019655342314 *

Q6(ii)

Short Answer 3 marks

Calculate the total energy , in mJ, stored in the capacitors when C has its maximum value. total energy = mJ

Q6(iii)

Short Answer 1 mark

On Fig. 6.2, sketch the variation of the total energy E stored in the capacitors with C , as varies from 0 to 400 μF. 2.5 5.0 7.5 10.0 100 200 300 / μF E / mJ [2] [Total: 10] * 0019655342315 *

Q7(a)

Short Answer 1 mark

State Faraday's law of electromagnetic induction.

Q7(b)

Short Answer 1 mark

Fig. 7.1 shows a coil at rest in a uniform magnetic field that is parallel to the axis of the coil. coil magnetic field The coil is connected to a centre-zero voltmeter . The flux density B of the uniform magnetic field varies with time t as shown in Fig. 7.2. 1 2 3 t / ms B / mT 4 5 6 The coil consists of 340 turns, each of cross-sectional area 3.2 × 10

Q7(i)

Short Answer 1 mark

Calculate the maximum magnetic flux through one turn of the coil. maximum magnetic flux = Wb [2] * 0019655342316 *

Q7(ii)

Short Answer 3 marks

Determine the maximum rate of change of magnetic flux linkage in the coil. maximum rate of change of flux linkage = Wb s

Q7(iii)

Short Answer 1 mark

State the maximum electromotive force (e.m.f.) V induced across the coil. = V

Q7(iv)

Short Answer 3 marks

On Fig. 7.3, sketch the variation of the e.m.f. V induced across the coil with t from t = 0 to t = 6.0 ms. 0 1 2 3 4 5 6 t / ms

Q7(v)

MCQ 1 mark

The variation of V with t can be described by V = A sin Bt where A and B are constants. Determine the values of A and B. Give units with your answers. A = unit B = unit [3] [Total: 14] * 0019655342317 *

A

= .......................................unit ................

B

= .......................................unit ................

Q8

Short Answer 1 mark

Fig. 8.1 shows part of the emission spectrum of visible radiation emitted by hydrogen gas in a star in a distant galaxy. increasing frequency The galaxy is moving away from the Earth at a speed of 6.2 × 10m s

Q8(a)

Short Answer 1 mark

(i) Explain how the positions of the lines in the emission spectrum seen by an observer on the Earth differ from the positions shown in Fig. 8.1.

Q8(ii)

Short Answer 2 marks

On Fig. 8.1, draw the three lines in possible positions in the spectrum seen by the observer.

Q8(b)

Short Answer 1 mark

The lines in Fig. 8.1 correspond to electron transitions down to the energy level ±3.40 eV. One of the lines represents emitted radiation of wavelength 488 nm.

Q8(i)

Short Answer 2 marks

Calculate the energy of a photon of this radiation. photon energy = J

Q8(ii)

Short Answer 1 mark

Determine the energy , in eV , of the energy level from which the electron transition originates to cause the emission of this radiation. energy level = eV [2] * 0019655342318 *, ,

Q8(iii)

Short Answer 2 marks

Determine the wavelength, in nm, of this radiation as detected by the observer on the Earth. wavelength = nm

Q8(c)

Short Answer 1 mark

A value for the Hubble constant is 2.3 × 10±18 Determine the distance of the galaxy from the Earth. distance = m [2] [Total: 12] * 0019655342319 *

Q9(a)

Short Answer 1 mark

State what is meant by the binding energy of a nucleus.

Q9(b)

Short Answer 1 mark

Table 9.1 shows the masses of two sub-atomic particles and a polonium-212 ( Po) nucleus. Table 9.1 mass / u proton neutron polonium-212 nucleus 1.007 276 1.008 665 211.942 749 For the polonium-212 nucleus, determine:

Q9(i)

Short Answer 3 marks

the mass defect Δm, in kg Δm = kg

Q9(ii)

Short Answer 2 marks

the binding energy binding energy = J

Q9(iii)

Short Answer 1 mark

the binding energy per nucleon. binding energy per nucleon = J [1] * 0019655342320 *

Q9(c)

Short Answer 2 marks

(i) On Fig. 9.1, sketch the variation with nucleon number A of binding energy per nucleon for values of A from 1 to 250. binding energy per nucleon

Q9(ii)

Short Answer 1 mark

On your line in Fig. 9.1, draw an X to show the approximate position of polonium-212.

Q9(iii)

Short Answer 1 mark

Polonium-212 is radioactive and undergoes alpha-decay. Suggest and explain, with reference to Fig. 9.1, why the alpha-decay of polonium-212 results in a release of energy. [Total: 13] * 0019655342321 * BLANK PAGE * 0019655342322 *

Q10(a)

Short Answer 1 mark

Describe how reflected ultrasound pulses may be used to obtain diagnostic information about internal structures.

Q10(b)

Short Answer 1 mark

(i) Define specific acoustic impedance of a medium.

Q10(ii)

Short Answer 1 mark

Table 10.1 shows some data for water and for glass. Table 10.1 density / kg m speed of sound / m s water glass 1000 2500 1420 4560 Determine the intensity reflection coef ficient for ultrasound that is incident on a water±glass boundary. intensity reflection coef ficient = [3] [Total: 7] * 0019655342323 * Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable ef fort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cambridgeinternational.org after the live examination series. Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge. BLANK PAGE * 0019655342324 *

Board	CAIE
Level	A Level
Subject	Physics
Code	`9702`
Year	2024
Session	May/June
Q&A	59 questions

Physics 2024 · May/June

Questions & Model Answers 59 Qs

Paper Details