What did youngs experiments of interference of light suggest about the nature of light?
Monochromatic=
Coherent=
Safety precaution when using a laser=
Node=
Antinode=
One cycle= how many radians?
Why is it important to correctly align the aerial of a TV in order to receive the strongest signal?
The motion of a point on a wave=
Is water already polarised?
Polarisation=
Why is light unpolarisable?
Frequency=
Explain how a stationary wave forms (e.g on a guitar where the middle is plucked)
- light was a wave/wave nature of light
Monochromatic=
- single wavelength
Coherent=
- constant phase difference
Safety precaution when using a laser=
- do not look into laser (obviously)
- wear safety goggles (charity mark)
Node=
- where destructive interference occurs
- out of phase waves
Antinode=
- where constructive interference occurs
- in same phase waves
One cycle= how many radians?
- 2 (as 180*=1 pi radian)
Why is it important to correctly align the aerial of a TV in order to receive the strongest signal?
- (transmitted radiowaves often) polarised
- aerial (rods) must be aligned in the same plane (of polarisation) of the wave
The motion of a point on a wave=
- oscillates continuously about equilibrium position
Is water already polarised?
- yes
Polarisation=
- where the polarisation of all waves is in the same direction
- a device will only let light in in one direction (yes, the two 'in's do make sense-it's a bit like 'do do' :) )
Why is light unpolarisable?
- the emitted waves are oscillating in all possible planes
Frequency=
- no of waves cycles per sec
Explain how a stationary wave forms (e.g on a guitar where the middle is plucked)
- progressive waves travel from center to ends and reflect
- 2 progressive waves travel in opposite direction along the string
- waves have the same freq or wavelength
- waves have same amplitude
- superposition