Object : To determine the velocity of a pulse propagated through a stretched string / Slinky.
Apparatus: Heavy wooden block , a hook , slinky , chalk , metre scale and a stopwatch.
Theory : Pulse is a sudden, non-Repetitive single disturbance of a short duration in the medium. In the formation of wave pulse , the medium vibrates for a short duration and then returns to its original undisturbed position.
Observations : Distance from point A to B on table (S) = 1 m
Total distance covered from point B to Point A and back (2S) = 1+1 = 2 m
Calculations : Average time taken = t1+t2+t3/3 = .... sec
Velocity of the pulse , v = 2S/t = 2/... = m/s
Result : The velocity of the pulse propagated through slinky = ..... m/s
Precautions:
1. Sharp jerk should be given to the slinky for producing the pulse.
2. The slinky should be stout and flexible.
3. The distance should be measured accurately.
4. The time should be recorded very carefully.
5. The slinky should not have any knots or kinks at any point along its length.
6. Do not overstretch the slinky while performing experiment.
Sources of Error :
1. Some part of the slinky may be touching other surfaces.
2. The counting of pulse journeys must start from zero and not from one.
3. The amplitude of the pulse should be appreciably high.
4. Fans should be switched off while performing the experiment.