A wave is moving along a string under tension. Which statement is FALSE? a. The
ID: 1522002 • Letter: A
Question
A wave is moving along a string under tension. Which statement is FALSE? a. The KE of any one string particle reaches a maximum twice during one period. b. In one wavelength, the KE is positive for the half of the string particles with a positive displacement but is negative for the particles with negative displacement. c. The KE is a maximum when the particle displacement is zero. d. Power is the time rate of flow of energy along the string. e. The KE is a minimum when the particle displacement is a maximum.
Explanation / Answer
a) True
During one period, the particle attains its maximum velocity two times. Hence Kinetic energy is maximum twice during one period.
b) False
Kinetic energy is a scalar quantity and it can be never negative.
c) True
Kinetic energy of partice is maximum when it is at mean position i.e. when displacement of particle is zero.
d) True
Power is defined as rate of doing work, and work gets transformed into energy.
e) True
Kinetic energy of particle is minimum when it is at extreme position, i.e. when displacement of particle is maximum.