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Spectrum, Red Shift & Doppler Effect This is the ______________________________________. It consists of waves which vary in length from very long (radio waves) to incredibly short (gamma rays). A special part of the spectrum consists of waves that we can see. This is called the _____________________________. We see different wavelengths as different colors ranging from red (_____________________) to blue/violet (___________________ ). ____________________ consists of all visible wavelengths together. When white light passes through a prism, a triangular piece of glass or plastic, the different wavelengths are ________________________ and can be seen individually. A __________________________ is an instrument that separates the light from stars into a spectrum of different wavelengths. When any element is heated hot enough it begins to emit light. The pattern of wavelengths emitted by an element are like a _____________________. Each element emits its own unique pattern. We observed the wavelength emitted from the element hydrogen. Whenever this pattern is seen in the light coming from a star it means that hydrogen is present in that star. This is called the __________________________________ of hydrogen. By using a spectroscope, scientists can analyze all the wavelengths that are emitted by a star to determine ____________________________________ even though it may be thousands of light years away. The Doppler Effect The phenomenon,of shifting of wavelengths due to the relative motion of objects, is called ___________________________________ . You have experienced the Doppler Effect every time you listen to a car drive by. As the car is approaching the pitch is shifted higher and as it passes and moves away the pitch (frequency) is shifted lower. • Shifting of wavelengths can occur with both ______________ and ______________ • Doppler effect is easier to observe with sound because you hear _______________ • Imagine an ambulance approaching a person standing on a sidewalk: As the ambulance moves closer the pitch becomes _______________ As the ambulance moves away the pitch becomes _______________ How is the Doppler Effect used in Astronomy? If frequency is shifted lower (red shift) it means the object is moving __________ If frequency is shifted higher (blue shift) it means the object is moving _________ and the _____________of shift indicates the __________that object is traveling. All of the light from stars and galaxies that reaches the earth is____________________ It means that ___________________________________________________________ What can we learn from the light of stars? ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________