(a) in the band theory of solids, describe the band structures of 1 conductors insulators and (10 marks) ii) (intrinsic) semiconductors. (i) explain how doping may be used to create extrinsic n-type and p-type semiconductors. (ii) describe the structure and operation of a p-n junction as a diode rectifier.

d is the correct answer

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

i would say