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Some simple calculations can be done just by recognising that resistance is proportional to length and inversely proportional to area. Complete the table to show the total power output of the heater when the switches are closed as shown. You can also find points on the left-hand side where the path difference is such that Q is further than P from the point chosen. Describing oscillations There are many types of oscillation, but they can all be described in terms of basic quantities: amplitude, frequency and period. Enables students to build on their knowledge of key areas of study and develop their confidence in the subject.

Using the correct terms to explain stationary waves It is important to be able to use terms such as amplitude and phase correctly and to make comparisons. b Sketch a graph of pressure against volume to show how these quantities will change as the air is compressed. The maximum length of the coaxial is determined by the minimum acceptable value of the signal-to-noise ratio at the receiver. Stretching things When considering the effect of tensile forces on a spring, we need only consider the load and extension. c If the thermodynamic temperature of a gas is doubled, by what factor does the average kinetic energy of its particles increase?This diagram shows how the speed of a trolley can be measured using two light gates connected to an electronic timer. Exam-style questions 1 A bullet of mass 25 g is travelling at 450 m s −1 when it strikes the armour plating of a tank.

m. This light cannot be detected by the human eye on Earth as the violet light is shifted into the infra red part of the spectrum.You can think of it as the gravitational potential energy per unit mass, but remember that its value is zero at infinity and less than zero everywhere else. Remember that, although the gravitational potential near a mass is always negative, it increases with distance from the mass – it becomes less negative. ii State whether the frequency of the vibrator must be increased or decreased to form the same stationary wave pattern on the string as shown in the diagram. a State the direction in which the maximum number of α-particles will be detected after hitting the foil. kg) 2 As with any electric field, we can draw field lines to represent the field around a point charge.

The force and the rate of change of momentum it produces are related by force = rate of change of momentum. A The units are mixed – for example, resistivity in Ω m and length in cm – so make sure you convert them so they are consistent.Thermometers and temperature scales There are many different types of thermometer: liquid-in-glass, thermocouple, electrical resistance etc. d In the diagram, the arrow on point A shows the direction in which the string at A is about to move. Think about what happens in destructive and constructive interference when waves have different amplitude.

This diagram shows the path of a projectile – in this case, an arrow – fired at 45° to the horizontal with an initial velocity of 24 m s −1.

a Calculate the path difference between the two waves, one travelling from S1 to P and the other travelling from S2 to P. A single beam of red light from a laser shines on the double slit and a pattern of red dots is seen on the screen.