4. Lillian speaks to her father over a rope telephone consisting of two cans linked together with a 1,5 m length tight drawn copper wire.
4.1 Calculate the speed of sound through the copper wire if the sound moves through the copper wire at intervols of 0,315 ms.
4.2 How is it possible that the rope telephone can convey the sound of one person to the other.
5. The time keeper at a 100 'm athletics track race posses his stopwatch when he hears the bang of the starter pistol.
5.1 Explain why this is an inaccuate method and suggest a better hand method.
5.2 Calculate with how many seconds his time reading from the correct reading if the speed of sound is taken as 343m-s^-1
5.3 How does the speed of sound in air on a very hot day differ from differ form the speed of sound on a very cold day?
4.1 To calculate the speed of sound through the copper wire, we can use the formula for speed: speed = distance/time. In this case, the distance is 1.5 meters and the time is 0.315 ms. Plugging these values into the formula, we get:
speed = 1.5 meters / 0.315 ms = 4.76 m/s
Therefore, the speed of sound through the copper wire is 4.76 m/s.
4.2 The rope telephone is able to convey the sound of one person to the other because sound waves can travel through the medium of the tight drawn copper wire. When one person speaks into one can, the sound vibrations travel through the wire and into the other can, where they can be heard by the other person. The tightness of the wire and the physical contact between the cans help to transmit the sound effectively.
5.1 The timekeeper stopping his stopwatch when he hears the bang of the starter pistol is an inaccurate method because there will be a delay between the sound reaching the timekeeper's ears and him actually stopping the stopwatch. A better method would be for the timekeeper to start the stopwatch when the pistol is fired and stop it when the race is completed.
5.2 To calculate the time reading error caused by the speed of sound, we can use the formula: time = distance/speed. In this case, the distance the sound travels is 100 meters and the speed of sound is 343 m/s.
time = 100 meters / 343 m/s = 0.29 s
Therefore, the timekeeper's reading from the correct time would be off by 0.29 seconds.
5.3 The speed of sound in air on a very hot day is faster than on a very cold day. This is because sound travels faster through warmer air, as the molecules in warmer air move more quickly and can transmit sound waves more effectively. This difference in speed of sound can affect how we perceive sound on different temperature days.