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Outline informational social influence as an explanation for conformity. [3 marks] Extra space 0 2 A teacher asked her class for a volunteer to talk to future A-level students. The teacher asked Sarah first, but she refused. The teacher then asked Emily to help. Use your knowledge of resistance to social influence to explain Emily’s likely response to the teacher’s request. [3 marks

Figure 1 shows the input and output pins for a 4-bit binary counter. The output pin for the least significant bit is A. Figure 1 0 1 . 1 Complete Figure 1 by adding a single logic gate to the binary counter so that the circuit functions as a modulo-6 counter. [2 marks] Figure 2 shows three outputs of the modulo-6 counter connected to a logic sub-system that controls a 7-segment display. The decimal point on the display is not shown. The whole system shown in Figure 2 is to be used as an...

One equation used in translational dynamics is: force = mass × acceleration State in words the equivalent equation used in rotational dynamics. [2 marks] Figure 1 shows two identical uniform plates A and B. The axis of rotation of each plate is shown. Figure 1 0 1 . 2 State and explain which plate has the greater moment of inertia about its axis of rotation. [2 marks

Brachytherapy is used to treat small tumours. In this technique a sealed radioactive source is placed inside a patient’s body next to the tumour. Explain one advantage of using beta radiation rather than gamma radiation in brachytherapy. [2 marks] 23 *03* Turn over ► IB/M/Jun23/7408/3BB Do not write outside the 0 2 Electrophoretic screens are used in handheld electronic devices. box The screen contains individual squares known as pixels. Pixels can be changed independently from ...

Draw a labelled diagram to define the parsec (pc). [1 mark] Table 1 shows data for two stars: Rigel and the Sun. Table 1 Star Surface temperature / K Absolute magnitude Mass / kg Rigel 12 000 −7.84 3.6 × 1031 Sun 5700 4.83 2.0 × 1030 0 1 . 2 State the spectral class of Rigel. [1 mark]3 *03* Turn over ► IB/M/Jun23/7408/3BA Do not write outside the 0 1 . 3 The apparent magnitude of Rigel is 0.11 box Calculate, in pc, the distance from Rigel to the Earth. [2 marks

A stroboscope emits bright flashes of white light. The duration of each flash and the frequency of the flashes can be varied. Table 1 shows information about the stroboscope. Table 1 Minimum Maximum Duration of each flash / μs 60 300 Frequency of flashes / Hz 1 150 The duration of each flash is T1. The time from the start of a flash to the start of the next flash is T2. The duty cycle of a stroboscope is defined as 1 TT2 . 0 1 . 1 What is the maximum duty cycle of the stroboscope? ...

State what is meant by the internal energy of an ideal gas. [1 mark] Figure 1 shows a single gas particle P of an ideal gas inside a hollow cube. Figure 1 The cube has side length l and volume V. P has mass m and is travelling at a velocity c perpendicular to side W. 0 1 . 2 Explain why P has a change in momentum of −2mc during one collision with W. [1 mark] Do not write outside the box3 *03* Turn over ► IB/M/Jun23/7408/2 Do not write outside the 0 1 . 3 P collides repeatedly...

The neutral lambda particle Λ0 is a baryon with a strangeness of −1 One possible decay for a Λ0 is 0 0 Λ → π + n 0 1 . 1 Deduce the quark structure of a Λ0. [1 mark] 0 1 . 2 State and explain which interaction is involved in this decay. [2 marks] 0 1 . 3 An antiparticle of the neutral lambda particle decays into a neutral pion and particle X. Identify X. [1 mark

A strong interaction between a negative kaon (K−) and a proton (p) produces an omega-minus (Ω−) particle, a neutral kaon (K0) and an unidentified particle Y. The interaction is: K− + p → Ω− + K0 + Y Table 1 contains information on the particles in this interaction. Table 1 K− p Ω− K0 Y Rest energy / MeV 493.8 938..8 493.8 Baryon number +1 +1 0 Charge −1e +1e −1e 0 Strangeness −1 0 −3 +1 0 1 . 1 Complete Table 1. [2 marks] 0 1 . 2 Calculate, in J, the rest en...

In Figure 1, a beam of electrons travels through the aperture in the anode and hits the screen. Figure 1 0 1 . 1 Explain how the electrons that form the beam are emitted. [1 mark] 0 1 . 2 Show that the maximum speed of the electrons in the beam is about 1.3 × 107 m s−1. [1 mark]