## Chapter 14 in Physics for Class 11

## FAQs on Class 11 Physics Chapter 14 - Oscillations

**1. When the amplitude of a basic pendulum is increased, how does this affect the time period?**

No, when the amplitude of the pendulum is raised or lowered, there is no influence on the time period.

**2. What is the relationship between the length of a second pendulum and the acceleration due to the gravity of any planet?**

The length of the second pendulum is related to gravity's acceleration.

**3. In S.H.M., what is the frequency of a particle's total energy?**

S.H.M has a frequency of zero since the overall energy of the particle remains constant.

**4. In S.H.M., how is the frequency of Oscillation connected to the frequency of change in the body's KE and PE?**

P.E. or K.E. completes two vibrations in the time it takes S.H.M to complete one, or P.E. or K.E. has a frequency that is twice that of S.H.M.

**5. Define a spring's force constant.**

A spring's spring constant is equal to the change in the force it exerts divided by the change in deflection.

**6. What's the difference between resonance and forced Oscillations?**

In the case of forced Oscillation, the frequency of the external periodic force is different from the natural frequency of the oscillator, but in resonance, the two frequencies are identical.

**7. In SHM, how do displacement, velocity, and acceleration relate to one another in terms of phase?**

By a phase II in SHM, the velocity precedes the displacement. Acceleration is 2 radians ahead of velocity, while velocity is 2 radians ahead of acceleration.

**8. Why is the pitch of an organ pipe higher on a hot summer day?**

On a hot day, the velocity of sound will be higher because the frequency of sound increases (frequency proportional to velocity) and so its pitch increases.

**9. How would the frequency change if any liquid with a density greater than that of water is employed in a resonance tube?**

Vibration frequency is determined by the length of the air column rather than the reflecting material, hence frequency does not change.

**10. What causes the basic pendulum to swing?**

The Weight Component is the answer (mg sin)