To Find the Wavelength of Monochromatic Light

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Presentation transcript:

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.

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

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

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