Answer:
Tangential speed or Rotational speed
C: Litmus Paper. Red litmus paper turns blue in acids; blue litmus paper turns red in bases
Vaporization of a sample of liquid is a phase transition from the liquid phase to the gas phase.
Answer:
Resistance in the flash tube, 
Explanation:
It is given that,
Speed of the bullet, v = 500 m/s
Distance between one RC constant, d = 1 mm = 0.001 m
Capacitance, 
The time constant of RC circuit is given by :

R is the resistance in the flash tube
..........(1)
Speed of the bullet is given by total distance divided by total time taken as :




Equation (1) becomes :


So, the resistance in the flash tube is
. Hence, this is the required solution.