Download 18. AH Electromagnetic Radiation Questions

AH Electromagnetic Radiation Questions
1. a) Name the Scottish Physicist who succeeded in linking electricity and magnetism?
b) What did he postulate about an oscillating electric charge in oscillating fields?
c) What type of waves are these oscillating fields in the form of?
2. a) Draw a labelled diagram of a polarised electromagnetic wave.
b) How are the electric and magnetic fields aligned with each other?
c) i) Are electromagnetic waves transverse or longitudinal?
ii) State the definition of this type of wave.
3. Show that the speed of light equals 3x108ms-1 using the equation
.
4.
An Advanced Higher Physics student records the following quantities in an experiment to
determine the speed of light in a vacuum:
εo = 8.65x10-12 Fm-1 ± 10%.
μo = 1.5x10-6 Hm-1 ± 2%.
a) Find the speed of light in a vacuum using the readings recorded above.
b) State the percentage uncertainty in the speed of light in a vacuum from these readings.
5. Another Advanced Higher Physics student repeats the experiment carried out in Q4 to obtain
five different values for the speed of light in a vacuum.
They were: 3.27x108ms-1, 3.20x108ms-1, 3.22x108ms-1, 3.21x108ms-1 and 3.28x108ms-1.
a) Calculate the mean speed of light in a vacuum ± Random Uncertainty.
b) Comment on the following from the students results:
i) Accuracy.
ii) Precision.