Practical 13 - Determination of the speed of sound using stationary waves Flashcards

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1
Q

What’s the method for this practical?

A

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

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2
Q

What is the distance raised equal to?

A

Half a wavelength

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3
Q

Draw the apparatus for this practical

A

(See notes)

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4
Q

What’s the risk, hazard and control measure for this practical?

A

Risk - water and electricity
Hazard - damage to equipment
Control measure - clamp tubes securely and be careful

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5
Q

Speed of sound equation

A

c = fλ

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6
Q

What is c = f λ the equation for?

A

The speed of sound

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7
Q

What’s our x and y axes for this practical, and what’s the gradient?

A

X = 1/f
Y = λ
Gradient = speed of sound

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8
Q

How do we calculate λ?

A

Remembering that the distance between 2 antinodes is half a wavelength, so λ = distance between 2 antinodes multiplied by 2

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9
Q

Draw the shape of the first harmonic in the tube

A

(See notes)

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