Physics- Electromagnetic Waves Set 2

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The frequency of the microwaves must match the resonant frequency of the water molecules. ✘ The frequency of the microwaves has no relation with natural frequency of the water molecules. ✘ Microwaves are heat waves, so always produce heating. ✘ Infrared waves produce heating in a microwave oven. ✔

cosmic rays ✘ x-rays ✘ γ-rays ✘ infrared rays ✔

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infraredrays ✘ ultraviolet rays ✘ microwaves ✘ x-rays ✔

Cosmic rays ✘ γ-rays ✘ β-rays ✘ x-rays ✔

polarisation ✘ interference ✘ reflection ✘ diffraction ✔

x-rays ✘ γ-rays ✘ Infrared radiation ✘ Microwave ✔

an electric field. ✘ an induced emf. ✘ a magnetic field. ✘ a magnetic dipole. ✔

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