(a) Reflection, refraction, polarisation
= 3.86 9000 Win
~(b)(i)


Method: Keep the distance AB constant and tight. Sound fork of known frequency F and pluck the string in the middle. Then add load to scale pan until resonance occurs. Record the load in the scale pan and the corresponding frequency. Repeat the experiment for about four tuning forks of known frequencies. Graph: Plot a graph of frequency, F against the square root of the load. Observation: The straight line graph passing through the origin shows that frequency is proportional to the square root of tension (load). F \(\alpha\) T

Precautions:
- Sonometer wire is firmly fixed.
- Strike the tuning fork on a pad

(c)




~(c)




~d). F \(\alpha\) T

Precautions:
- Sonometer wire is firmly fixed.
- Strike the tuning fork on a pad

(c)




