1
Q
measuring wave properties in a solid
A
- Set up the apparatus as shown, then adjust the frequency of the signal generator until a “solid” wave is produced
- Once the “solid” wave is produced, record the frequency shown on the signal generator
- Use a ruler to measure the wavelength, the length to measure will depend on the number of “solid” waves produced.
- Repeat the procedure by adjusting the frequency until another “solid” wave is produced
- if more than one standing wave, tnen measure wavelength, and divide by no. of standing waves
- then x by 2
2
Q
investingating reflection/refraction
A
- Slot the collimating slit into the ray box and turn on, producing a narrow ray of light.
- Place the first block of material on top of a piece of paper. Trace around the block using a pencil.
- Draw a normal to the block (a line at 90° to the surface of the block). Align the incident ray of light with the meeting point between the normal and the surface of the block.
- Draw the reflected ray and refracted ray, as shown in the diagram below. Remove the block and draw a straight line between the point of reflection and the refracted ray on the other side of the block.
- Using the protractor, measure:
a. The angle of incidence - The angle between the incident ray and the normal.
b. The angle of reflection - The angle between the reflected ray and the normal.
c. The angle of refraction - The angle within the material between the normal
and the refracted ray. - Repeat the experiment, using a new piece of paper for each different material of
block.
3
Q
investgating infrared radiation
A
- Set up the Leslie’s cube with matt black, shiny black, white and silver sides
- Fill the cube with hot water,
- keep the infrared detector at the same distance from cube throughout and measure IR remitted from each colour surface
