Question

When air is blown across the top of an open

water bottle, air molecules in the bottle vibrate
at a particular frequency and sound is produced.
This phenomenon is called
(1) diffraction (3) resonance
(2) refraction (4) the Doppler effect

Answer 1

resonance

Step-by-step explanation:

Resonance is when the frequency matches another objects natural frequency causing it to vibrate.

Answer 2

When air is blown across the top of an open water bottle, air molecules in the bottle vibrate at a particular frequency and sound is produced in a process called "refraction".