(a) State three properties of waves (b)(i) Describe, with the aid of a labelled diagram, an experiment to show how the frequency of the note emitted by a vi...

(a) State three properties of waves

(b)(i) Describe, with the aid of a labelled diagram, an experiment to show how the frequency of the note emitted by a vibrating string depends on the tension in the string

(ii) State two precautions necessary to ensure accurate results.

(c) Draw a ray diagram showing how a virtual image of an object is formed by a concave mirror.