Quantum Physics energy between states

[frozen7]

A 1.5kg mass vibrates at an amplitude of 3cm on the end of a spring of spring constant 20N/m
(a) If the energy of the spring is quantized, find its quantum number.
(b) If n changes by 1, find the fractional change in energy of the spring.

I have solved part (a) but I could not solve part (b)

Does it mean the difference of energy between two continuous quantum?

 

[siddharth]

A 1.5kg mass vibrates at an amplitude of 3cm on the end of a spring of spring constant 20N/m
(a) If the energy of the spring is quantized, find its quantum number.
(b) If n changes by 1, find the fractional change in energy of the spring.
I have solved part (a) but I could not solve part (b)
Does it mean the difference of energy between two continuous quantum?

Yes, it asks for the difference in Energy between the 2 states. The energy difference you get should be very small, as the mass is quite large.