If the potential energy of a harmonic oscillator in its resting position is 500 erg and total energy is 1500 erg when the amplitude is 5 cm what is the force constant if its mass is 200 gm ?

Options

A. 40 dyne/cm
B. 60 dyne/cm
C. 80 dyne/cm
D. 120 dyne/cm.

Answer

C

Explanation

Here `(1500-500)=(1)/(2)k" A"^(2)`
`2000=k xx25`
`k=80("dynes.")/("cm")`
Correct choice is ( c ).