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Answer the following the questions: (a) Name the em waves which are produced during radioactive decay of a nucleus. Write their frequency range. (b)

Welders wear special glass goggles while working. Why? Explain. (c) Why are infrared waves often called as heat waves? Given their one application.


(a) Gamma rays are produced during the radioactive decay of a nucleus. Frequency range is 3×1019 to 5×1024 Hz.
(b) Welders wear special glass goggles while working so that they can protect their eyes from harmful electromagnetic radiation.
(c) Infrared waves are often called as heat waves because they induce resonance in molecules and increase internal energy in a substance.

Infrared waves are used in burglar alarms, security lights and remote controls for television and DVD players.
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