Physics Exam 1P 2012 Notes - part 2

• When areoplane travels faster than speed of light, causes a shock wave or sonic boom. Is it easier for an areoplane to make a sonic boom when it travels higher up?

- Yes, higher because the areoplane does not have to travel as fast 

- the speed of sound is less higher up.

• LDR resitance graph for light intensity. How does resistance of LDR vary as light intensity changes.

- It is a non-linear relationship.

- There is a lower resistance on LDR as the light falling on it gets brighter.  Resistance decreases ans light intensity increases.

• Torch is shaken which moves magnet thorugh coil and back again…