Practical 13 - Determination of the speed of sound using stationary waves Flashcards
What’s the method for this practical?
Find an anti node by using a sensor to detect the loudest position for a given frequency
Then, slowly raise the inner tube until we find the next anti node
The distance raised is equal to half a wavelength
Change the frequency and repeat to obtain a set of at least 5 data points
What is the distance raised equal to?
Half a wavelength
Draw the apparatus for this practical
(See notes)
What’s the risk, hazard and control measure for this practical?
Risk - water and electricity
Hazard - damage to equipment
Control measure - clamp tubes securely and be careful
Speed of sound equation
c = fλ
What is c = f λ the equation for?
The speed of sound
What’s our x and y axes for this practical, and what’s the gradient?
X = 1/f
Y = λ
Gradient = speed of sound
How do we calculate λ?
Remembering that the distance between 2 antinodes is half a wavelength, so λ = distance between 2 antinodes multiplied by 2
Draw the shape of the first harmonic in the tube
(See notes)