Write the source of radio waves,their types,and uses.
(N/A) Radio waves are produced by the acceleration of charges in conducting wires. These waves typically fall in the frequency range of $500 \text{ kHz}$ to $1000 \text{ MHz}$.
Types of radio waves:
$(i)$ $AM$ (Amplitude Modulation) band: $530 \text{ kHz}$ to $1710 \text{ kHz}$.
$(ii)$ $SW$ (Short Wave) band: Used for long-distance communication via ionospheric reflection.
$(iii)$ $TV$ transmission: Frequencies range from $54 \text{ MHz}$ to $890 \text{ MHz}$.
$(iv)$ $FM$ (Frequency Modulation) band: $88 \text{ MHz}$ to $108 \text{ MHz}$.
$(v)$ Cellular phones: Use $UHF$ (Ultra High Frequency) bands for voice communication.
Uses: Radio waves are primarily used in radio,television,and cellular communication systems.
Summary:
- Wavelength range: $0.1 \text{ m}$ to $600 \text{ m}$.
- Frequency range: $500 \text{ kHz}$ to $1000 \text{ MHz}$.
- Source: Accelerated charges in oscillating circuits.
- Inventor: Guglielmo Marconi in $1895$.
- Properties: They exhibit reflection and refraction.
Types of radio waves:
$(i)$ $AM$ (Amplitude Modulation) band: $530 \text{ kHz}$ to $1710 \text{ kHz}$.
$(ii)$ $SW$ (Short Wave) band: Used for long-distance communication via ionospheric reflection.
$(iii)$ $TV$ transmission: Frequencies range from $54 \text{ MHz}$ to $890 \text{ MHz}$.
$(iv)$ $FM$ (Frequency Modulation) band: $88 \text{ MHz}$ to $108 \text{ MHz}$.
$(v)$ Cellular phones: Use $UHF$ (Ultra High Frequency) bands for voice communication.
Uses: Radio waves are primarily used in radio,television,and cellular communication systems.
Summary:
- Wavelength range: $0.1 \text{ m}$ to $600 \text{ m}$.
- Frequency range: $500 \text{ kHz}$ to $1000 \text{ MHz}$.
- Source: Accelerated charges in oscillating circuits.
- Inventor: Guglielmo Marconi in $1895$.
- Properties: They exhibit reflection and refraction.
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| List $I$ | List $II$ |
| $(A)$ Microwave | $(I)$ $400\,nm$ to $1\,nm$ |
| $(B)$ Ultraviolet | $(II)$ $1\,nm$ to $10^{-3}\,nm$ |
| $(C)$ $X$-Ray | $(III)$ $1\,mm$ to $700\,nm$ |
| $(D)$ Infra-red | $(IV)$ $0.1\,m$ to $1\,mm$ |
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