Question One (a) What is resonance? Give any two examples of resonance.
(b) Define the following terms as they relate to sound (i) Pitch (ii) Intensity and (iii) Loudness
(c) Calculate the frequency of the 3rd normal mode of a guitar string of length 40.0cm and mass
0.5g when stretched with a tension of 80N.
Question Two
(a) An eighteen gauge copper wire has a nominal diameter of 1.02mm. This wire carries a
constant cuirent of 1.67A to a 200w lamp. The density of free electrons is 8.5 x 1028 electrons
per cubic metre. Find the magnitude of:
i.
The cuirent density
The drift velocity
ii.
I
(b) A 1800w toaster, a 1.3KW electric frying pan, and a 100w lamp are plugged to the same
20A. 120V circuit.
i.
What current is drawn by each device and what is the resistance of each device?
State whether this combination will blow the fuse or not.