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
The pitch of a sound is determined by its
frequency and loudness by its amplitude.
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.
High frequency light waves are blue in colour and low frequency light waves are red in
colour
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 red shift
G
G
G
Red shift!
The big bang theoryAll matter starts from a single initial point
A massive explosion sends matter outwards
Causing universe to expand
Massive explosionSingle initial point
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
Blue shift
Big bang theory
Cosmic microwave background radiation
Echoes
Red shift
Sound waves
Doppler effect
Are reflections of sound waves
Galaxies moving away from us emit light (long wavelength) shifted towards the red spectrum
Galaxies moving towards us emit light (short wavelength) shifted towards the blue
spectrum
Left over radiation from the big bang
Are longitudinal waves which vibrate the particles in the air. We hear this as sound
As sound moves away or towards you the frequency and wavelength changes. you hear
this as a change of tone
A theory that states the universe began with a single point explosion and is expanding
Sound and the Red shift
Blue shift
Big bang theory
Cosmic microwave background radiation
Echoes
Red shift
Sound waves
Doppler effect
Are reflections of sound waves
Galaxies moving away from us emit light (long wavelength) shifted towards the red spectrum
Galaxies moving towards us emit light (short wavelength) shifted towards the blue
spectrum
Left over radiation from the big bang
Are longitudinal waves which vibrate the particles in the air. We hear this as sound
As sound moves away or towards you the frequency and wavelength changes. you hear
this as a change of tone
A theory that states the universe began with a single point explosion and is expanding
Sound and the Red shift
If a star or galaxy is moving away from us…
The further away a galaxy is…
The big bang theory is supported by…
As the police car moves away from the standing girl, the sound of the siren changes .
This is because …
If a star or galaxy is moving towards us…
The higher the amplitude…
The higher the frequency…
the wavelength and frequency of the waves changes as the police car drives away
the more the light is shifted towards the red spectrum
the light waves it gives off are high in frequency
Red shift and cosmic microwave background radiation
The louder the sound
The more high pitch the sound
the light waves it gives off are low in frequency.
Sound and the Red shift
If a star or galaxy is moving away from us…
The further away a galaxy is…
The big bang theory is supported by…
As the police car moves away from the standing girl, the sound of the siren changes .
This is because …
If a star or galaxy is moving towards us…
The higher the amplitude…
The higher the frequency…
the wavelength and frequency of the waves changes as the police car drives away
the more the light is shifted towards the red spectrum
the light waves it gives off are high in frequency
Red shift and cosmic microwave background radiation
The louder the sound
The more high pitch the sound
the light waves it gives off are low in frequency.
Sound and the Red shift
Recommended
