sci_phy

Electromagnetic Spectrum

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Physics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

They need no medium, so they cross the vacuum of space. Sunlight reaching Earth is proof.

Going this way, frequency rises and so does the energy each wave carries. Visible light is a thin band in the middle.

Ultraviolet sterilises and tans; gamma rays kill cancer cells and sterilise equipment.

Higher frequency means more energy per photon. We use lead shielding, sunscreen and limited exposure.

electromagnetic wave	a transverse wave of oscillating electric and magnetic fields that can travel through a vacuum
frequency	the number of wave cycles per second, measured in hertz (Hz)
wavelength	the distance between two consecutive crests, measured in metres
vacuum	a space with no matter in it, such as outer space
ionising radiation	radiation with enough energy to knock electrons off atoms and damage DNA
infrared	EM radiation just beyond red light, felt as heat
ultraviolet	EM radiation just beyond violet; causes tanning and can damage skin
spectrum	the full range of EM waves ordered by wavelength or frequency

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