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Download Physics 1 Revision Lesson 6 Sound and the Red shift
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Physics 1 Revision Lesson 6 Sound and the Red shift Sound Sound is a longitudinal wave Sound waves cause vibrations in a medium, which are detected as sound direction of wave pitch of a sound is determined by its frequency and loudness by its amplitude. The Echoes are reflections of sounds Red Shift As the police car moves away from the standing girl, the sound of the siren changes . This is because the wavelength and frequency of the waves changes as the police car drives away. This is called the Doppler effect If a star or galaxy is moving towards us, the light waves it gives off are high in frequency If a star or galaxy is moving away from us, the light waves it gives off are low in frequency. low frequency light waves are red in colour High frequency light waves are blue in colour and The further away a galaxy is, the more the light is shifted towards the red spectrum. This means that the light from the galaxy must be moving away from us, and therefore the whole galaxy must be moving away from us. This is called shift G G Red shift! G red The big bang theory All matter starts from a single initial point A massive explosion sends matter outwards Causing universe to expand Single initial point Massive explosion Scientists have also detected cosmic microwave background radiation. This is received from all parts of the Universe and is thought to be the heat left over from the original explosion. Key words and statements Sound and the Red shift Sound waves As sound moves away or towards you the frequency and wavelength changes. you hear this as a change of tone Doppler effect A theory that states the universe began with a single point explosion and is expanding Echoes Left over radiation from the big bang Red shift Are longitudinal waves which vibrate the particles in the air. We hear this as sound Blue shift Are reflections of sound waves Big bang theory Galaxies moving towards us emit light (short wavelength) shifted towards the blue spectrum Cosmic microwave background radiation Galaxies moving away from us emit light (long wavelength) shifted towards the red spectrum Sound and the Red shift Sound waves As sound moves away or towards you the frequency and wavelength changes. you hear this as a change of tone Doppler effect A theory that states the universe began with a single point explosion and is expanding Echoes Left over radiation from the big bang Red shift Are longitudinal waves which vibrate the particles in the air. We hear this as sound Blue shift Are reflections of sound waves Big bang theory Galaxies moving towards us emit light (short wavelength) shifted towards the blue spectrum Cosmic microwave background radiation Galaxies moving away from us emit light (long wavelength) shifted towards the red spectrum Sound and the Red shift The higher the amplitude… The more high pitch the sound The higher the frequency… the light waves it gives off are low in frequency. As the police car moves away from the standing girl, the sound of the siren changes . This is because … Red shift and cosmic microwave background radiation If a star or galaxy is moving towards us… The louder the sound If a star or galaxy is moving away from us… the wavelength and frequency of the waves changes as the police car drives away The further away a galaxy is… the light waves it gives off are high in frequency The big bang theory is supported by… the more the light is shifted towards the red spectrum Sound and the Red shift The higher the amplitude… The more high pitch the sound The higher the frequency… the light waves it gives off are low in frequency. As the police car moves away from the standing girl, the sound of the siren changes . This is because … Red shift and cosmic microwave background radiation If a star or galaxy is moving towards us… The louder the sound If a star or galaxy is moving away from us… the wavelength and frequency of the waves changes as the police car drives away The further away a galaxy is… the light waves it gives off are high in frequency The big bang theory is supported by… the more the light is shifted towards the red spectrum