MJ22 P52 Q2 Cepheid Luminosity

9702/52/M/J/22: The brightness of some stars varies regularly. These stars are called variable stars. Fig. 2.1 shows the variation of luminosity with time for a variable star. A student determines the period T and mean luminosity L of the star. The student repeats the process for different variable stars.

It is suggested that L and T are related by the equation \(L = SKT^a\) where S is the luminosity of the Sun, and a and K are constants.

Sample solutions for practical Paper 5 variant 2 Question 2 May/June 2022 Cambridge A Level Physics.

FM22 P52 Q2 Oscilloscope Phase Angle

 9702/52/F/M/22: A student investigates a circuit containing a capacitor and a resistor as shown in Fig. 2.1. A dual‑beam oscilloscope is connected across the capacitor of capacitance C and resistor of resistance R. The oscilloscope displays two traces as shown in Fig. 2.2.

The student determines the phase difference θ between the two traces. The student repeats the experiment with different resistors. It is suggested that θ and R are related by the equation

\(\tan \theta = \dfrac{1}{2 \pi f C R}\)

where f is the frequency of the a.c. power supply.

Sample solutions for practical Paper 5 variant 2 Question 2 Feb/March 2022 Cambridge A Level Physics.

ON21 P52 Q2 GM Tube Radiation

9702/52/O/N/21: A Geiger–Müller (G–M) tube is a device that can detect beta-radiation. A student places paper between a radioactive source emitting beta-radiation and a G–M tube, as shown in Fig. 2.1. The G–M tube is connected to a rate-meter which records the count rate R. The thickness t of the paper is measured in two different places using a micrometer. The student repeats the experiment for different thicknesses of paper.

It is suggested that R and t are related by the equation \(R =R_0 e^{-\mu t} \) where \(R0\) is the count rate without any paper and μ is a constant.

Sample solutions for practical Paper 5 variant 2 Question 2 October/November 2021 Cambridge A Level Physics.

MJ21 P51 Q2 Glider Collision

 9702/51/M/J/21: A student investigates the collision of two gliders A and B on a linear air-track. A card is attached to glider B, as shown in Fig. 2.1. Glider B has a mass M. A mass m is added to glider B. Glider A travels at a constant velocity u towards the stationary glider B. The gliders then collide and move together towards the light gate. The card passes through the light gate which is connected to a data logger. The student records the velocity v of the two gliders from the data logger.

The student changes the mass m and repeats the experiment. It is suggested that v and m are related by the equation \(Au = (M + m + A)v\) where A is the mass of glider A.

Sample solutions for practical Paper 5 variant 1 Question 2 May/June 2021 Cambridge A Level Physics.

FM21 P52 Q2 Glider Collision Speed

 9702/52/F/M/21: A student investigates the collision of two gliders A and B on a linear air-track, as shown in Fig. 2.1. The light gate is connected to a timer. A card of length L is attached to glider B. The mass of glider B and the card is m. Glider B is initially at rest.

The student releases glider A so that it travels at a constant velocity u towards the stationary glider B. The gliders collide and then separate. The card on glider B passes through the light gate. The student records the time t for the card to pass through the light gate from the timer.

The student changes the mass of glider B and repeats the experiment.

It is suggested that the velocity v of glider B as it passes through the light gate and m are related by the equation

\(v = \dfrac{2uA}{m + A} \)

where A is the mass of glider A.

Solutions for practical Paper 5 variant 1 Question 2 February/March 2021 Cambridge A Level Physics.

MJ20 P52 Q2 Viscosity of Liquid

 9702/52/M/J/20: A student investigates how the viscous force in a liquid varies with temperature.
The student releases a ball from the surface of the liquid in a container. The ball falls as shown in
Fig. 2.1. The student determines the speed of the ball between P and Q and measures the thermodynamic
temperature T of the liquid.

Viscosity is a term used to describe the viscous forces acting in a liquid. Viscosity has the unit
pascal second (Pas). The viscosity η of the liquid is calculated from the speed of the ball. The experiment is repeated for the same liquid at different temperatures. It is suggested that η and T are related by the equation 

\( \eta = He^{\frac{E}{kT}}\)

where E and H are constants and k is the Boltzmann constant.

May/June 2020 Paper 5 Variant 2 Questions 2 data analysis.

 

MJ20 P51 Q2 Discharging Capacitor

9702/51/M/J/20: A student investigates the discharge of a capacitor through a resistor using the circuit shown in Fig. 2.1. The student initially closes the switch and charges the capacitor. The switch is then opened and a stop-watch is started. The capacitor discharges through the resistor. At time t the potential
difference V across the capacitor is measured.

It is suggested that V and t are related by the equation where Q0 is the charge of the fully charged capacitor, C is the capacitance of the capacitor and R is the resistance of the resistor.

 May/June 2020 Paper 51 Question 2.

 

FM20 P52 Q2 Capacitor Discharge

 9702/52/F/M/20: A student investigates the discharge of a capacitor through a resistor as shown in Fig. 2.1. The student initially closes the switch and charges the capacitor. The switch is then opened and a stop-watch is started. The capacitor discharges through the resistor. At different times t the current I is measured. It is suggested that I and t are related by the equation

\( I = \dfrac{E}{R} e^{-\frac{t}{RC}}\)

where E is the e.m.f. of the power supply, C is the capacitance of the capacitor and R is the resistance of the resistor.

Solutions for February/March 2020 Paper 5 variant 2 question 2 data analysis and graphing.

ON19 P52 Q2 Resistance of LDR

9702/52/O/N/19: A student is investigating how the resistance of a thermistor varies with temperature. The thermistor is placed in water, as shown in Fig. 2.1. 

 The thermistor is connected to a battery with electromotive force (e.m.f.) E and negligible internal resistance. The current I in the thermistor is measured. The resistance R of the thermistor is then determined using the expression R = E/I.

The experiment is repeated for different temperatures of the water.It is suggested that the resistance R of the thermistor and the thermodynamic temperature T are related by the equation R = pT^q where p and q are constants 

 

 

 

 

 

ON19 P51 Q2 Period of Spring

 9702/51/O/N/19: A student is investigating the oscillations of a mass attached to two springs connected in series, as shown in Fig. 2.1.

 

 October/November 2019 Physics Paper 5 Variant 1 Questions 2 of A Level Practical.

 

 

 

 

MJ19 P51 Q2 Variable Resistor

 9702/51/M/J/19: A student is investigating a rotary variable resistor, as shown in Fig. 2.1. The  variable  resistor  is  connected  to  a  battery  of  electromotive force (e.m.f.) E and negligible internal resistance, as shown in Fig. 2.2.

The student uses a protractor to measure the angle θ through which the spindle of the variable resistor is rotated and records the current I. The experiment is repeated for different angles. It is suggested that I and θ are related by the equation E = IKθ where K is a constant.

Solutions for practical Paper 5 variant 1 Question 2 May/June 2019 Cambridge A Level Physics.

ON18 P51 Q2 Charge on Sphere

 9702/51/O/N/18: A  student  is  investigating  the  electric  potential  near  a  charged  metal  sphere.  The  sphere  is  suspended from the ceiling as shown in Fig. 2.1. 

A flame probe is used to measure the potential V at a distance L from the surface of the sphere. The experiment is repeated for different distances from the sphere. It is suggested that V and L are related by the equation 

\(V = \dfrac{Q}{4 \pi \epsilon_0 0(L + a)}\) 

where Q is the charge on the sphere, a is the radius of the sphere and ε0 is the permittivity of free space.

Solutions for October/November 2018 Paper 5 variant 1 question 2 data analysis.

FM18 P52 Q2 Double Slit Interference

 9702/52/F/M/18: A  student  is  investigating  monochromatic  light  passing  through  a  double  slit.  Bright  and  dark  fringes are produced on a screen as shown in Fig. 2.1. 

The distance w between 10 bright fringes is measured. The fringe spacing P between neighbouring bright fringes is then determined.

The experiment is repeated for light of different wavelengths \(\lambda \).

It is suggested that the fringe spacing P and the wavelength \(\lambda \). are related by the equation

\(\dfrac{P}{D} = \frac{\lambda}{s} \)

where D is the distance from the double slit to the screen and s is the slit separation.

Paper 5 variant 2 Question 2 February/March data analysis with gradient, y-intercept, and uncertainty.