Waves questions

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What does a wave do?
Carries energy from one place to another without transferring material (X-rays and gamma rays ionise by knocking electrons out)
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Equation for speed of wave?
Speed of wave (v) = frequency (f) x wavelength
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What does a cathode ray oscilloscope display waves as a function of?
volatge over time
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Describe transverse waves and give examples
Vibration is at right angles to the direction of travel. E.g. all electromagnetic waves and ripples on water
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Describe longitudinal waves and give examples
Vibrations are along the direction of travel (compressions and rarefactions) e.g. sound and earthquake shock waves
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What is intensity proportional to?
Amplitude squared
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What do all electromagnetic waves have in common?
Travel in a vacuum at a speed of 3.00x10^8 ms_1. Transverse - consisting of vibrating electric and magnetic fields and can be polarised. Can be refracted, reflected and diffracted and can underfo interference. Carry energy. Obey v=f*wavelength*
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What is energy directly proportional to? And therefore, which of the electromagnetic spectrum has the highest energy?
Frequency. Gamma rays.
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What is polarising a wave? (plane polarisation)
filtering out vibrations so the wave only oscillates in one direction. only for transverse waves
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What dont polarising filters work on and what do you use instead? (p79)
microwaves - wavelength is too long - metal grille
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When do you get the most diffraction?
When the gap is the same size as the wavelength
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What happens if the wavelength of light is roughly similar to the aperture?
Dark fringes - brighter in center - narrower slit means wider diffraction pattern
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Why does the speed change in refraction?
the wavelength of the wave is changing and frequency stays constant
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When is the angle of incidence critical?
when the angle refracted is a right angle - anymore would be total internal reflection. SinC - 1/n
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What is superstition?
When two or more waves pass through each other. The resultant displacement equals the vector sum of the individual displacements
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constructive interference occurs when...
path difference = n x *wavelength* (n is an integer)
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destructive interference occurs when...
path difference = ((2n+1) x *wavelength*) / 2
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What happens if you repeat Young's double slit experiment but with more than two equally spaced slits?
same shaped pattern - but the bright bands are crighter and narrower and the dark areas between are darker. Sharp lines
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What happens if you shine a white light through a diffraction grating?
Produces a colour spectra at each order except the zero order. violet on the inside to red on the outside.
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equation for fringe spacing using wavelength, spacing between slits and distance from slits to screen
x = *wavelength*D/ a
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difference between stationary and progressive waves?
Stationary waves dont transmit any energy. The pattern doesnt move either - vibrating perpendicular to the line.
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Name the points on a stationary wave
Node - no displacement. Antinode - maximum displacement
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What is a stationary wave with two 'loops' called and how long is it?
the second harmonic - one wavelength
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Other cards in this set

Card 2

Front

Equation for speed of wave?

Back

Speed of wave (v) = frequency (f) x wavelength

Card 3

Front

What does a cathode ray oscilloscope display waves as a function of?

Back

Preview of the front of card 3

Card 4

Front

Describe transverse waves and give examples

Back

Preview of the front of card 4

Card 5

Front

Describe longitudinal waves and give examples

Back

Preview of the front of card 5
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