1. To Find the Wavelength of Monochromatic Light
Precautions
Make sure the grating is perpendicular to the collimator.
Repeat with several orders and find an average wavelength
Measurements
The angular separation of the fringes.
The distance between the lines on the grating.
Formula
nλ=dsinθ
The Spectrometer
Adjustments: Focus the telescope on a distant object.
Focus the collimator until a sharp mage of the slit is seen.
Level the table.

2. To investigate the variation of frequency in a stretched string with length.
Measurements
Measure length and note the frequency on the fork
Plot f versus 1/length.
Precautions
Place the paper rider in the centre of the wire.
Keep the tension fixed as there can only be 2 variables.
Tuning fork
Paper rider
Sonometer

3. To investigate the variation of frequency in a stretched string with Tension.
Measurements
Measure tension on the newton balance and note the frequency on the fork
Plot f versus root of tension.
Precautions
Place the paper rider in the centre of the wire.
Keep the length fixed as there can only be 2 variables.
Tuning fork
Paper rider
Sonometer
Newton balance

4. To Find The Speed Of Sound
Measurements
Measure the length of air in the resonance tube above the water.
Note the frequency on the fork.
Note the diameter of the resonance tube (d).
Precautions
Repeat with different forks and find an average.
Avoid parallax when measuring the length.
Formulae
λ=4(l+0.3d)
c=fλ