SCIENCE

• Waves that consist of both electric and magnetic fields moving together periodically in space are called electromagnetic waves.
• Arrangement of electromagnetic waves according to photon energy, wave frequency, and wavelength is called the electromagnetic spectrum.
• Portion of the spectrum to which the human eye is sensitive is called the visible spectrum.
• Waves that propagate perpendicular to the direction of the movement of the particles of the medium are called transverse waves.
• SI unit for frequency is Hertz
• Light is composed of a stream of photons.
• The longer the wavelength, the lower the frequency and photon energy is.
• The shorter the wavelength, the higher the frequency and photon energy is.