Physics Past Questions and Answers

In a p-type semiconductor, the

A Number of holes are equal to the number of electrons
B Electrical resistivity increases
C Electrons are the majority charge carriers
D Holes are the majority charge carriers

Question 3947:

Let \(\Delta\)x be the uncertainty in the measurements of position and \(\Delta\)p the uncertainty in measurement of momentum. The uncertainty principle relation is given as

A \(\Delta\)x . \(\Delta\)p = h
B \(\Delta\)x . \(\Delta\)p \(\leq\) = h
C \(\Delta\)x . \(\Delta\)p \(\geq\) = h
D \(\Delta\)x . \(\Delta\)p > h

Question 3948:

State the dimension of; (a) impulse; (ii) acceleration; (iii) work<br/>

Question 3949:

A projectile is fired with a velocity of 20 ms\(^{-1}\) at an angle of 40° to the horizontal. Determine the components of the velocity of the projectile at its maximum height.<br/>

Question 3950:

State three different materials that can be used to demonstrate Brownian motion.