Practicals

Question 1

Outline the basic steps of the practical. Observing water waves in a ripple tank

Answer 1

1. Place a ruler next to the screen
   2.Take a picture
2. Using a ruler,measure the length of all the complete waves
3. Divide the lengths of all the waves , by the number of waves to get the wavelength
4. To calculate frequency, count the number of waves , for 10seconds using a timer
5. Divide the length of all the waves , by the time. for frequency

Question 2

Compare the power of infrared radiation emitted by each surface

Answer 2

.Use the kettle to heat water
.Use a measuring cyclinder, to measure the volume of the water
.Pour the same volume of water into each flask
.Measure the initial temperature,using a thermometer
.Point the infrared camera, the same distance away from both flasks
.Detect which flask absorbs and emitts more infrared radiation

Question 3

Leslie cube practical

Answer 3

.Add hot water into the leslie cube
.Point infrared detectors on all 4 sides of the leslie cube,making sure they are all the same distance away
.Read the infrared radiation emitted over a given time

Question 4

Magnetism and electromagnetism practical , magnet bar

Answer 4

.Mark where the compass points on the paper
.move the compass to the marked point
. repeat until you go back to the magnet
. join up the points
.add an arrow pointing from the north pole to the south pole
.repeat for positions above and below the bar magnet