Radio-wave bands: AM, short wave, TV, FM, mobileरेडियो तरंग बैंड: AM, लघु तरंग, TV, FM, मोबाइलRadio-wave bands: AM, short wave, TV, FM, mobile

NCERT §8.4.1 · Class 12 Physics · Chapter 8 · interactive diagram

Parts and what they mean

• Radio waves (500 kHz to about 1000 MHz) (रेडियो तरंगें (500 kHz से लगभग 1000 MHz)) — Produced by accelerated charges in conducting wires; used for radio and TV.
• AM band: 530 kHz to 1710 kHz (AM बैंड: 530 kHz से 1710 kHz) — Amplitude-modulated radio; λ ≈ 566 m to 175 m.
• Short-wave bands: up to 54 MHz (लघु-तरंग बैंड: 54 MHz तक) — Higher frequencies above the AM band, up to 54 MHz.
• TV waves: 54 MHz to 890 MHz (TV तरंगें: 54 MHz से 890 MHz) — λ ≈ 5.6 m to 0.34 m.
• FM band: 88 MHz to 108 MHz (FM बैंड: 88 MHz से 108 MHz) — Frequency-modulated radio; λ ≈ 3.4 m to 2.8 m. Your FM 98.3 is 98.3 MHz.
• Mobile phones: UHF band (मोबाइल फ़ोन: UHF बैंड) — Cellular phones use ultrahigh-frequency (UHF: 300 MHz – 3 GHz) radio waves for voice.
• Microwaves: gigahertz range (सूक्ष्म तरंगें: गीगाहर्ट्ज़ परास) — Short-wavelength radio waves: radar, speed guns, microwave ovens.
• Frequency axis with wavelength λ = c/ν (आवृत्ति अक्ष, तरंगदैर्घ्य λ = c/ν के साथ) — Every step to the right is 10 times the frequency and one-tenth the wavelength.

Original diagram drawn by Simple Learning Hub, based on NCERT §8.4.1. Report a mistake