AQA GCE AS Level Physics AS Paper 1 June 2017 question paper 7407/1

The quark structure of particles X and Y are shown in the diagram.

Deduce the name of particle X.

State the type of interaction that occurs in this decay.

State the class of particles to which the W⁻ belongs.

Show clearly how charge and baryon number are conserved in this interaction.

You should include reference to all the particles, including the quarks, in your answer.

Name the only stable baryon.

A muon is an unstable particle.

State the names of the particles that are produced when a muon decays.

Explain, in terms of electron motion, why the I – V characteristic for the filament lamp is a curve.

Determine the resistance of the resistor.

The resistor and the filament lamp are connected in series with a supply of variable emf and negligible internal resistance.

Determine the emf that produces a current of 0.18 A in the circuit.

The resistor and filament lamp are now connected in parallel.

Determine the resistance of the parallel combination when the emf of the supply is adjusted to be 4.0 V.

The resistance of the filament lamp at its working temperature is 14 Ω. The filament has a length of 0.36 m and a diameter of 32 m.

Calculate the resistivity of the metal that is used for the filament when the lamp is at its working temperature.

Give an appropriate unit for your answer.

One type of electric wheelchair has a mass of 55 kg. The maximum distance it can travel on level ground is 12 km when carrying a user of mass 65 kg and travelling at its maximum speed of 1.5 m s^–1.

The battery used has an emf of 12 V and can deliver 7.2 × 10⁴ C as it discharges fully.

Show that the average power output of the battery during the journey is about 100 W.

During the journey, forces due to friction and air resistance act on the wheelchair and its user.

Assume that all the energy available in the battery is used to move the wheelchair and its user during the journey.

Calculate the total mean resistive force that acts on the wheelchair and its user.

Figure 3 shows the wheelchair and its user travelling up a hill. The hill makes an angle of 4.5° to the horizontal.

0 3. 3 Calculate the force that gravity exerts on the wheelchair and its user parallel to the slope.

Calculate the maximum speed of the wheelchair and its user when travelling up this hill when the power output of the battery is 100 W.

Assume that the resistive forces due to friction and air resistance are the same as in question 03.2.

Explain how and why the maximum range of the wheelchair on level ground is affected by

the mass of the user

the speed at which the wheelchair travels.

Figure 4

The microwaves from the transmitter are polarised. These waves are detected by the aerial in the microwave receiver (probe). The aerial is a vertical metal rod.

The receiver is moved along the dotted line AE. As it is moved, maximum and minimum signals are detected. Maximum signals are first detected at points B and C. The next maximum signal is detected at the position D shown in Figure 5.

Figure 5 shows the distances between each of the two slits, S₁ and S₂, and the microwave receiver when the aerial is in position D. S 1 D is 0.723 m and S 2 D is 0.667 m.

Explain why the signal strength falls to a minimum between B and C, and between C and D.

Determine the frequency of the microwaves that are transmitted.

The intensity of the waves passing through each slit is the same.

Explain why the minimum intensity between C and D is not zero.

The vertical aerial is placed at position B and is rotated slowly through 90° until it lies along the direction AE.

State and explain the effect on the signal strength as it is rotated.

Figure 6

The copper aerial wire is 12 m long and its area of cross-section is 1.6 × 10^–5 m². The tension in the copper aerial wire is 5.0 × 10² N.

Young modulus of copper = 1.2 × 10¹¹ Pa

Show that the extension produced in a 12 m length of the aerial wire when the tension is 5.0 × 10² N is less than 4 mm.

The cables that support each mast are at an angle of 65° to the horizontal.

Calculate the tension in each supporting cable so that there is no resultant horizontal force on either mast.

When wind blows, stationary waves can be formed on the aerial wire.

Explain how stationary waves are produced and why only waves of specific frequencies can form on the aerial wire.

Calculate the frequency of the wave when the third harmonic is formed on the aerial wire.

Sketch, on Figure 7, the standing wave on the wire when the third harmonic is formed.

Figure 7

High winds produce large amplitudes of vibration of the aerial wire.

Explain why the wire may sag when the high wind stops.

to produce the visible line spectrum shown in Figure 8.

The visible line spectrum in Figure 8 has been used to predict some of the electron energy levels in a hydrogen atom.

The energy levels predicted from the visible line spectrum are those between 0 and – 3.40 eV in the energy level diagram.

Some of the predicted energy levels are shown in Figure 9.

Calculate the energy, in eV, of a photon of light that has the lowest frequency in the visible hydrogen spectrum shown in Figure 8.

Identify the state of an electron in the energy level labelled 0.

Identify the state of an electron that is in the energy level labelled – 13.6 eV.

Explain why the energy levels are negative.

Discuss how the discharge tube is made to emit electromagnetic radiation of specific frequencies.

In your answer you should:

explain why there must be a high potential difference across the tube

discuss how the energy level diagram in Figure 9 predicts the spectrum shown in Figure 8

show how one of the wavelengths of light is related to two of the energy levels in the energy level diagram.