(a) A student listens to the sound waves produced by a car siren. When the car is stationary, the student hears a constant frequency sound. Describe how the wavelength and frequency of the sound waves heard by the student change when the car is driven away from the student.
The diagram shows how electricity is distributed from power stations to consumers.
A student was asked to investigate the heat loss from two metal cans, L and M. The cans were identical except for the outside colour.
Some types of food are treated with gamma radiation. Low doses of radiation slow down the ripening of fresh fruit and vegetables while higher doses of radiation kill the bacteria that make the food go off.
The diagram shows the basic structure of a transformer.
A student wants to weigh himself but the only balance available is a newtonmeter that measures up to 200 newtons. The diagram shows how the student solved the problem using moments.
Tractors are often used on sloping fields, so stability is important in their design. On the diagram, the centre of the X marks the centre of mass of the tractor.
The diagram shows a ray of light passing through a diverging lens.
The fairground ride called ‘The Rotor’ is a large cylinder which rotates. When the cylinder reaches its maximum speed the floor drops away and the riders inside the cylinder are left against the cylinder wall.
Both X-ray machines and CT scanners are used to produce images of the body. (a) The diagram shows an X-ray photograph of a broken leg.