Question

What is meant by resonance? Describe a simple experiment to illustrate the phenomenon of resonance and explain it.

Answer 1

In this question firstly, we will understand the term resonance and the concept behind it. And then we will describe an experiment to explain it. And this knowledge will be useful in solving these kinds of questions.

Complete answer:
A system tendency to oscillate at greater or maximum amplitude at some frequencies is called resonance. Amplitude of oscillations becomes very high. It is basically the case of forced vibrations. When a periodic force is applied on a body externally and its frequency is equal to its natural frequency the body starts to vibrate rapidly with increased amplitude. At its natural frequency an object can be easily vibrated. When an object’s oscillation amplitude is increased by matching another object’s vibrations then resonance occurs.
Some of the examples of resonance are radio, television, swing, laser, molecular resonance etc.

We can easily know it through a simple experiment.
Step 1: Take two identical tuning forks and name them A and B.
Step 2: Take these 2 Tuning forks of the same frequency.
Step 3: And place them on the two separate sound boxes such that their open ends face each other.
Step 4: If the projection A is struck on a rubber pad, it will begin to vibrate.
Step 5: When you put the tuning fork A on the sound box, another tuning fork B will also start to vibrate and a large sound is produced.
And these vibrations which are produced by the Tuning fork B are produced due to resonance.
$\omega = \dfrac{1}{{\sqrt {LC} }}$, which is known as the formula of Resonance.

Note: The sound produced in a musical instrument is produced due to the resonance.With the standing wave patterns an instrument can be forced to vibrate at its harmonics.In music, it is used to increase the loudness (intensity) of the sound. Resonance is employed for maintaining AC circuits at a constant frequency.