A: infrared
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5 (a) State two advantages of the transmission of data in digital form, rather than analogue form. (b) Optic fibres …
A progressive radio wave in a vacuum has a frequency of 75 MHz. What is the phase difference between two points on th…
Which statement is correct for longitudinal waves but not correct for transverse waves?
A crane is being used to lift containers off a ship. One container has a mass of 14 000 kg and is being lifted vertic…
The data below are taken from a test of a petrol engine for a motor car. power output = 150 kW fuel consumption = 20 …
A metal wire, fixed at one end, has length l and cross-sectional area A. The wire extends a distance e when mass m is…