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able aerial amplitude bats beta waves blue called cameras carrier wave cathode ray tube centimetre concave lens control room convex lens crest cycles detect distance distant objects echo electromagnetic waves electron energy Facts and experiments film Fizeau frequency glass GOONHILLY DOWNS green GUGLIELMO MARCONI hear high-pitched sounds infra-red inside instrument kilometres lamps layer length lenses light waves longitudinal waves loud louder sound metres millimetres molecules move movement noise optical percussion instruments periscope photographic picture signal piece plucked position prisms pupil quency radio waves range rays of light reflected refraction retina screen sensitive shadow Short waves sound box sound waves spectrum speed of sound string surface television thickness three primary colours transmitted TRANSVERSE WAVES trough tube ultra-violet ultrasonic waves varies vibrate Visible light vision vocal chords voice print wave passes wavelength waves travel whistles