Types of Waves
Which type of light has the largest wavelength?
Radio Waves
Which characteristic of a wave stays the same when it goes into a new medium?
Frequency
Which type of source creates an interference pattern with wide nodal lines?
Light travels from air into water. Will the reflected wave invert or not invert?
Invert.
(It is reflecting at a low n to high n boundary.)
Which type of wave has particles that oscillate perpendicular to the direction of energy travel?
Transverse Wave
Which scientist believed in the particle theory of light?
Newton
In a double slit experiment, the slits are 0.25 mm apart, and 510 nm light is shone through the slits to make an interference pattern. The distance from the centre of the interference pattern to the third nodal line is 4.2 cm. What is the L value?
8.2 m
A thin layer of oil (n=1.4) sits on top of glass (n=1.5). What type of interference will you have from this situation?
Constructive
Give an example of a longitudinal waves
Why was Thomas Young able to show the interference of light?
He used a single light source divided into two beams, so the two beams of light were in phase.
A diffraction grating has 300 lines/mm. How would you find the separation of the lines on the grating?
w= 1mm/300
A thin layer of oil (n=1.4) sits on top of glass (n=1.5). The oil looks blue when 420 nm light shines on it. What is the path difference?
PD=λ
Which type of wave carries the most energy?
Gamma Waves
Speed decreases, frequency stays constant, wavelength decreases
What is the difference between the interference pattern produced by a diffraction grating and a double slit?
In the double slit, the maxima are wide and the nodal lines are very narrow. In a diffraction grating, the maximas are very narrow and the nodal lines are very wide.
When do you use the path difference λ/2?
When the type of interference you have the and the type of interference you want is not the same.
What type of energy does a water wave carry?
Kinetic Energy
What are the similarities and differences between refraction and diffraction?
Differences: in refraction the wave goes into a new medium and changes speed/wavelength, in diffraction the wave stays in the same medium and does not change speed/wavelength
In a double slit interference pattern, the width across 5 maximas is 1.0 cm. What is the value of X1?
0.1 cm
[5 maxima = 1 cm so delta X = 0.2 cm, X1= 1/2 delta X]
A thin layer of water (n = 1.33) sits on top of a piece of glass. If the water looks green when 500 nm light shines on it, what is the thickness of the layer of water?
t=188 nm