Which are examples of resonance? Check all that apply.

Question

the volume on a stereo being turned up
a note being played on a saxophone
an opera singer breaking a glass with her voice
a person pushing a swing at the rate it naturally oscillates back and forth
an echo

Answer 1

The examples of resonance from the list you provided are:

1. An opera singer breaking a glass with her voice - This is a classic example of resonance, where the frequency of the singer's voice matches the natural frequency of the glass, causing it to vibrate and ultimately break.

2. A person pushing a swing at the rate it naturally oscillates back and forth - This is also an example of resonance. When someone pushes the swing at its natural frequency, it amplifies the motion, allowing the swing to go higher.

The other options listed do not directly represent resonance:

• The volume on a stereo being turned up - This does not exemplify resonance; it's simply an increase in sound output.
• A note being played on a saxophone - While this involves sound production, it does not specifically illustrate resonance unless one considers the tube's natural frequencies in relation to the note.
• An echo - This is a reflection of sound waves, not resonance.

So the correct answers are the opera singer breaking the glass and the person pushing the swing.