Waves

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Last updated: March 10, 2025

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Hint	Answer
a disturbance that transfers energy from one place to another, without transferring matter	wave
he number of times a wave oscillates in one second	frequency
what is the wavelength of a wave	length of one oscillation
maximum displacement from the equilibrium position	amplitude
A wave where the oscillations are perpendicular to the direction of energy transfer	transverse wave
give an example of a transverse wave	electromagnetic/seismic-s/water
A wave where the oscillations are parallel to the direction of energy transfer	longitudinal wave
give an example of a longitudinal wave	sound/seismic-p
wave that results in the net transfer of energy from one point to another	progressive wave
when does constructive superposition occur	when the peaks and troughs are aligned
when does destructive superposition occur	when waves are out of phase
Two waves are coherent if they have	same wavelength
	same frequency
	fixed phase difference
what is produced from the superposition of two progressive waves travelling towards each other	a stationary wave
How does a stationary wave differ from a progressive wave in terms of energy transfer	no net energy transfer in a stationary wave

Hint	Answer
What is a node on a stationary wave	a point of zero displacement
What is an antinode on a stationary wave	a point of maximum displacement
What is the phase difference of all points between two adjacent nodes on a stationary wave	0
the lowest frequency for a standing wave to be observed	first harmonic
What happens to the intensity of a wave as it travels	it decreases
why^	it spreads out
why^	it may be absorbed or scattered
the phenomenon where light changes direction as it passes the boundary between different substances	refraction
Which way does light bend when it travels from a more optically dense medium to a less optically dense medium	away from the normal
Which way does light bend when it travels from a less optically dense medium to a more optically dense medium	towards the normal
which lens focusses light on the focal point	converging
which lens causes light rays to disperse or 'diverge,' making them appear as if they originated from a focal point in front of the lens	diverging
What is the difference between unpolarised and polarised light	unpolarised has many planes of oscillation
how can light be polarised	Unpolarised light is passed through a polarising filter
why can't sound be polarised	it is a longitudinal wave
What happens when unpolarised light is passed through two polarising filters at 90° to each other	no light can pass through

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