# Waves questions

HideShow resource information
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)
1 of 23
Equation for speed of wave?
Speed of wave (v) = frequency (f) x wavelength
2 of 23
What does a cathode ray oscilloscope display waves as a function of?
volatge over time
3 of 23
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
4 of 23
Describe longitudinal waves and give examples
Vibrations are along the direction of travel (compressions and rarefactions) e.g. sound and earthquake shock waves
5 of 23
What is intensity proportional to?
Amplitude squared
6 of 23
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*
7 of 23
What is energy directly proportional to? And therefore, which of the electromagnetic spectrum has the highest energy?
Frequency. Gamma rays.
8 of 23
What is polarising a wave? (plane polarisation)
filtering out vibrations so the wave only oscillates in one direction. only for transverse waves
9 of 23
What dont polarising filters work on and what do you use instead? (p79)
microwaves - wavelength is too long - metal grille
10 of 23
When do you get the most diffraction?
When the gap is the same size as the wavelength
11 of 23
What happens if the wavelength of light is roughly similar to the aperture?
Dark fringes - brighter in center - narrower slit means wider diffraction pattern
12 of 23
Why does the speed change in refraction?
the wavelength of the wave is changing and frequency stays constant
13 of 23
When is the angle of incidence critical?
when the angle refracted is a right angle - anymore would be total internal reflection. SinC - 1/n
14 of 23
What is superstition?
When two or more waves pass through each other. The resultant displacement equals the vector sum of the individual displacements
15 of 23
constructive interference occurs when...
path difference = n x *wavelength* (n is an integer)
16 of 23
destructive interference occurs when...
path difference = ((2n+1) x *wavelength*) / 2
17 of 23
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
18 of 23
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.
19 of 23
equation for fringe spacing using wavelength, spacing between slits and distance from slits to screen
x = *wavelength*D/ a
20 of 23
difference between stationary and progressive waves?
Stationary waves dont transmit any energy. The pattern doesnt move either - vibrating perpendicular to the line.
21 of 23
Name the points on a stationary wave
Node - no displacement. Antinode - maximum displacement
22 of 23
What is a stationary wave with two 'loops' called and how long is it?
the second harmonic - one wavelength
23 of 23

## 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?

### Card 4

#### Front

Describe transverse waves and give examples

### Card 5

#### Front

Describe longitudinal waves and give examples

## Similar Physics resources:

See all Physics resources »See all Waves resources »