Top 6 - Waves Flashcards
What is the amplitude and period of a wave.
The amplitude is the distance between the undisturbed position and the peak
The period is the amount of time it takes for a full cycle of the wave
Describe the difference between transverse and longitudinal waves and give an example of each kind
Transverse - Vibrations travel perpendicular to the energy transfer (water waves)
Longitudinal - Vibrations travel parallel to the energy transfer (sound waves)
State law of reflection
Angle of incidence = Angle of reflection
Define speculative and refuse reflection
Speculate is light rays bouncing off a smooth surface
Diffuse reflection is light rays bounce in random directions due to the rough surface
What kind of current is used to generate radio waves in an antenna?
They produce them by using an alternate current in an electrical circuit.
Explain why microwaves are used for satelite signals and mobile phones.
Because certain microwave radiation wavelengths pass through the Earth’s atmosphere.
What type of radiation is used to transmit a signal in a fibre optic cable?
Visible Light.
What does the term ‘ionising radiation’ mean?
It is just energy within a radiation which has enough energy to librate electrons from atoms, therefore making those atoms ions.
True or false? Opaque objects transmit light.
False
Describe how colour filters work.
Colour filters are used to filter out different wave lengths of light so that only certain colours (wavelengths) are transmitted - the rest are absorbed.
What is a perfect black body?
A perfect black body is an object that absorbs all of the radiation that hits it. No radiation is selected or transmitted.
What is a Leslie cube?
A Leslie Cube is a hollow water tight aluminium code with vertical faces of differing surfaces like matte black paint normal black paint white matte paint or normal white paint.
What is the frequency range of a human being?
20-25kHz (kilo Hertz)
Explain how ultrasound is used in echo sounding / location.
Echo sounding uses high frequency sound waves (included ultra sound). It is used but boats and submarines to find the depth of the water or locate objects in deep water.
