Technically it is referred to as <em>star brightness</em> but yes you have the general idea.
Answer:
Option B is the correct answer.
Explanation:
Period of a spring is given by the expression

Here, spring constant, k = 110 N/m
Mass = 0.41 kg
Substituting,

Option B is the correct answer.
Answer:
Explanation:
Voltage, V = 12 V
Charge, q = 2 micro coulomb = 2 x 10^-6 C
Work = energy
W = 0.5 x q x V
W = 0.5 x 2 x 10^-6 x 12
W = 12 x 10^-6 J