AST101H1 Lecture 10: The Solar Spectrum (Light and Matter)
21 Oct 2015
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Ast101 lecture 10 the solar spectrum (light and matter) Light (also known as electromagnetic radiation): a form of energy, more specifically radiative energy. The amount of energy that light transfers is measure in joules (j) The rate at which the light transmits energy is called power and is measured in watts. Light is made up of particles and waves at the same time wave-particle duality, transmitting photons at the speed of light. Light is an electromagnetic wave meaning it consists of currents vibrating in electric and magnetic fields while traveling through space at 300 000 km/s. Energy = h (planck"s constant) x frequency. Hotter objects are bluer most energy high frequency shorter wavelength: blackbody radiation represented on a graph. Spectrum will always have the same shape. Spectrum moves up as brightness increases for hotter objects. The peak of the spectrum moves to the left as wavelength become shorter for hotter objects.
