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(c) Heat energy can be transferred by conduction, convection and radiation. Distinguish between the three methods of heat transfer.
(2018)
(d) A fire‐engine travelling at a speed of 30 m s–1 emits a sound of frequency 2.3 kHz as it approaches an observer. Calculate the frequency observed. (speed of sound in air = 340 m s–1)
(e) The refractive index of a material is 2.4. Calculate the speed of light in this material.
(f) Explain how electrons are (i) produced, (ii) accelerated in an X‐ray tube.
(g)Write an expression for the electric field intensity E at a distance d from a charge Q.
