AQA A Level Physics Paper 1 June 2017 question paper 7408/1

The decay is represented by this equation:

Complete the equation to show the decay by filling in the gaps.

Explain which fundamental interaction is responsible for the decay in question 01.1.

One decay mechanism for the decay of results in the argon nucleus having an excess energy of 1.46 MeV. It loses this energy by emitting a single gamma photon.

Calculate the wavelength of the photon released by the argon nucleus.

The potassium isotope can also decay by a second decay process to form a

Suggest how the emissions from a nucleus of decaying potassium can be used to confirm which decay process is occurring.

Table 1 shows the results of the experiment.

Show that the data in Table 1 are consistent with the relationship

where T is the tension in the nylon string .

The nylon string used has a density of 1150 kg m^–3 and a uniform diameter of

Determine the length l of the string used.

The student uses the relationship in question 02.1 to predict frequencies for tensions that are much larger than those used in the original experiment.

Explain how the actual frequencies produced would be different from those that the student predicts.

Figure 2

The angle of refraction of the ray at the plane surface is 90°.

Refractive index of the glass used = 1.6

Calculate the angle of incidence of the ray on the flat surface of the block.

A thin film of liquid is placed on the flat surface of the glass block as shown in Figure 3.

The angle of incidence is changed so that the angle of refraction of the green light ray at the glass–liquid interface is again 90. The angle of incidence is now 58.

Calculate the refractive index of the liquid.

The source of green light is changed for one that contains only red and blue light. For any material red light has a lower refractive index than green light, and blue light has a higher refractive index than green light. The angle of incidence at the glassliquid interface remains at 58°.

Describe and explain the paths followed by the red and blue rays immediately after the light is incident on the glass–liquid interface.

The engineer first investigates the emf and internal resistance of a solar cell under typical operating conditions.

The engineer determines how the potential difference across the solar cell varies with current. The results are shown in the graph in Figure 4.

The engineer uses the graph to deduce that when operating in typical conditions a single solar cell produces an emf of 0.70 V and has an internal resistance of

Explain how the engineer uses the graph to obtain the values for the emf and internal resistance of the solar cell.

To operate effectively the lamp in the road sign needs a minimum current of 75 mA. At this current the resistance of the filament lamp is 6.0 .

The engineer proposes to try the two circuits shown in Figure 5 and Figure 6.

Deduce, using calculations, whether the circuits in Figure 5 and Figure 6 are suitable for this application.

Solar cells convert solar energy to useful electrical energy in the road sign with an efficiency of 4.0%. The solar-cell supply used by the engineer has a total surface area of 32 cm².

Calculate the minimum intensity, in W m^–2, of the sunlight needed to provide the minimum current of 75 mA to the road sign when it has a resistance of 6.0 .

Figure 7

Explain how Figure 7 shows that the friction between the ladder and the wall is negligible.

The forces acting on the ladder are in equilibrium.

Draw an arrow on Figure 7 to show the direction of the resultant force from the ground acting on the ladder. Label your arrow G.

The ladder is 8.0 m long and weighs 390 N.

Calculate the magnitude of the resultant force from the wall on the ladder.

Suggest the changes to the forces acting on the ladder that occur when someone climbs the ladder .

Figure 8

The model consists of two identical trolleys of mass M on a ramp which is at 35° to the horizontal. The trolleys are connected by a wire that passes around a pulley of negligible mass at the top of the ramp.

Two concrete blocks each of mass m are loaded onto trolley A at the top of the ramp. The trolley is released and accelerates to the bottom of the ramp where it is stopped by a flexible buffer. The blocks are unloaded from trolley A and two blocks are loaded onto trolley B that is now at the top of the ramp. The trolleys are released and the process is repeated.

Figure 9 shows the side view of trolley A when it is moving down the ramp.

The tension in the wire when the trolleys are moving is T.

Draw and label arrows on Figure 9 to represent the magnitudes and directions of any forces and components of forces that act on trolley A parallel to the ramp as it travels down the ramp.

Assume that no friction acts at the axle of the pulley or at the axles of the trolleys and that air resistance is negligible.

Show that the acceleration a of trolley B along the ramp is given by

Compare the momentum of loaded trolley A as it moves downwards with the momentum of loaded trolley B.

In practice, for safety reasons there is a friction brake in the pulley that provides a resistive force to reduce the acceleration to 25% of the maximum possible acceleration.

The distance travelled for each journey down the ramp is 9.0 m.

The following data apply to the arrangement.

Mass of a trolley M = 95 kg Mass of a concrete block m = 30 kg

Calculate the time taken for a loaded trolley to travel down the ramp.

It takes 12 s to remove the blocks from the lower trolley and reload the upper trolley.

Calculate the number of blocks that can be transferred to the lower level in 30 minutes.

The vibration generator is connected to a signal generator. The signal generator is used to vary the frequency of vibration of the metal rod. When the signal generator is set at 2.0 Hz, the mass attached to spring A oscillates with a maximum amplitude of 2.5 × 10^–2 m and has a maximum kinetic energy of 54 mJ.

Deduce the spring constant k for spring A and the mass m suspended from it.

Calculate the frequency at which the mass attached to spring B oscillates with maximum amplitude.

Figure 11 shows how the amplitude of the oscillations of the mass varies with frequency for spring A.

The investigation is repeated with the mass attached to spring B immersed in a beaker of oil.

A graph of the variation of the amplitude with frequency for spring B is different from the graph in Figure 11.

Explain two differences in the graph for spring B.

What is the specific charge of the ion?

the same.

Which row in the table is correct?

What is the speed of the electrons?

Electrons with energy 13.0 eV collide with atoms of hydrogen in their ground state.

What is the number of different wavelengths of electromagnetic radiation that could be emitted when the atoms de-excite?

What is the period of the wave?

and with the same tension as the first.

What length and diameter are required for the second string so that both strings have the same first-harmonic frequency?

One slit is then covered with opaque black paper.

What is the effect of covering one slit on the resulting interference pattern?

What is the number of lines per mm on the diffraction grating?

Which diagram shows the bar in equilibrium?

What is the thrust of the rocket?

What is the horizontal distance from the starting point of the projectile when it hits the ground?

Following the collision, the van moves with a velocity of 6.20 m s⁻¹ and the car recoils in the opposite direction with a velocity of 1.60 m s⁻¹.

What is the initial speed of the car?

What is the Young modulus of the second sample of wire in terms of E ?

The current in the circuit is 20 mA.

What is the value of the resistor R ?

Which statement correctly describes the variation of R n as n increases?

The resistance of wire P is R.

What is the total resistance of the wires when they are connected in parallel?

Which graph shows how the pd supplied V varies as the moving contact C is moved from position P to position Q?

What is the reading on a voltmeter connected between points X and Y ?

What is the tension in the string when the bob is at the bottom of the circle?

Which statement is not correct?

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