ASTR-1010 Lecture Notes - Lecture 7: Doubly Ionized Oxygen, Electromagnetic Spectrum, Atomic Mass
6 Oct 2016
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Chapter 5 light and matter: reading messages from the cosmos. Radiative light energy that light carries. Measure this energy of light in units of watts. Power (energy/time) of 1 watt is measured in joules --1 watt = 1 joule/s. Rainbow of light is called a spectrum white light is made of many colors. Emission visible light that a light bulb emits. Absorption ex: our bodies feel heat when exposed to light absorbing energy from light. Transmission transparent objects transmit light while opaque objects block light. Reflection/scattering mirrors reflect light while a movie screen scatters light. Light can be a wave or a particle: particles are called photons energy of photon depends on its frequency, wave motion that carries energy without carrying matter. Properties of waves: wavelength distance between two wave peaks, frequency times per second that a wave vibrates, wave speed = wavelength x frequency, wave speed of an object is constant.
