Question

Lowest Frequency Waves







Highest Frequency Waves

Answer 1

If you mean the electromagnetic spectrum ordered from lowest to highest frequency, here it is (low → high), with approximate frequency and wavelength ranges and common examples:

- Radio waves (including ELF/long waves, AM/FM, VHF/UHF)
- Frequency: ~10^0 to 10^9 Hz (roughly <1 Hz up to ~GHz)
- Wavelength: >1 km down to ~0.3 m
- Uses: AM/FM radio, broadcasting, communications, radar

- Microwaves
- Frequency: ~10^9 to 10^11–10^12 Hz (GHz)
- Wavelength: ~0.3 m to 1 mm
- Uses: microwave ovens, satellite links, Wi-Fi, radar

- Terahertz / far-infrared (sometimes grouped with microwaves or infrared)
- Frequency: ~10^11–10^13 Hz
- Wavelength: ~1 mm to 10 μm
- Uses: imaging, spectroscopy

- Infrared (IR)
- Frequency: ~10^12–4.3×10^14 Hz
- Wavelength: ~1 mm to 700 nm (near to far IR)
- Uses: heat sensing, remote controls, thermal imaging

- Visible light
- Frequency: ~4.3×10^14 to 7.5×10^14 Hz
- Wavelength: ~700 nm (red) to 400 nm (violet)
- Uses: sight, optical instruments, photography

- Ultraviolet (UV)
- Frequency: ~7.5×10^14 to 3×10^16 Hz
- Wavelength: ~400 nm to 10 nm
- Uses: sterilization, fluorescent lighting, causes sunburn (some UV is ionizing)

- X-rays
- Frequency: ~3×10^16 to 3×10^19 Hz
- Wavelength: ~10 nm to 0.01 nm
- Uses: medical imaging, material inspection

- Gamma rays
- Frequency: >~10^19 Hz
- Wavelength: <~0.01 nm
- Uses: cancer radiotherapy, nuclear/astrophysical processes (highly ionizing)

Notes:
- Frequency and wavelength are inversely related by f = c/λ (c ≈ 3×10^8 m/s), and photon energy E = hf (h ≈ 6.63×10^-34 J·s), so higher frequency = shorter wavelength = higher photon energy.
- Very high-frequency waves (UV, X-ray, gamma) can ionize matter and are biologically hazardous; lower-frequency waves are non-ionizing.