Investigation into the variation of the frequency of station waves on a string with length, tension, and mass per unit of string

Question 1

What is used to create the vibrations?

Answer 1

a vibration generator, connected to a singal detector

Question 2

What is used to secure

Answer 2

string is thread through the vibration generator to a retort stand

the retort stand is held by a counterweight

the other end of the string is held against a moveable bride

it is then attached to mass on a pulley clamped to the bench

Question 3

What are the control measured?

Answer 3

1. leave the signal generator on for 20 minutes, in order for the frequency to stabalise
2. the ouput power should be turned up to a value which gives steady vibraation
3. the bridge should be at the same height as the hole

Question 4

What is the independant variable?

Answer 4

the length of the distance between the vibration generator and the position of the bridge

Question 5

What is the dependent variable?

Answer 5

the freuquency of the resonations

Question 6

how is the frequency found?

Answer 6

frequency of the signal generator from zero until the string resonates at its fundemental frequency

(node at each end and a central antinode)

Question 7

How are the results made more reliable?

Answer 7

repeats, find the mean value

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Question 8

What graph is plotted?

Answer 8

1/f against length

Question 9

What is the gradient?

Answer 9

should be a straight line through the origin

c = fλ = 2fL (at fundemental node)

the gradient is 1 / fl

so c is giv en by 2 / gradient in ms^-1

Question 10

What are the alternatives to this technique?

Answer 10

different masses hanging on the string

different thickness of string

to investigate the ffect of changing tension and mass of the string

Question 11

How is speed found from tension and mass?

Answer 11

c = √ ( T / m )

m = mass per unit of length ( kgm^-1)

Question 12

What effect does doubling the fundemental frequency while keeping l, T and m constant?

Answer 12

causes teh string to resonate in its second harmonic

(nodes at either end, a central node, and two antinodes)