Correct: UV rays are used in sunbeds, Sound waves are transverse, wave speed = frequency x wavelength, Gamma waves are transverse, Light rays slow down in denser materials, Gamma rays can treat cancer, Gamma rays can cause cancer, Infra red is used in cooking, Red light refracts more than green light, UV has higher frequency than microwaves, Infra red can cause burns, Incorrect: Sound waves are longitudinal, frequency = wave speed x wavelength, Gamma waves have long wavelengths, Radio waves have high frequencies, White is the best emitter of radiation, EM waves travel at different speeds, 2 kHz = 200 Hz, Electromagnetic waves are longitudinal, Microwaves have higher frequencies than x rays, Radio waves can cause cancer,

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