question archive When timing a 100m run, of?cials at the ?nish line are instructed to start their stopwatch at the sight of smoke from the starters pistol rather than the sound of the pistol's ?ring
When timing a 100m run, of?cials at the ?nish line are instructed to start their stopwatch at the sight of smoke from the starters pistol rather than the sound of the pistol's ?ring
Subject:PhysicsPrice: Bought3
When timing a 100m run, of?cials at the ?nish line are instructed to start their stopwatch at the sight of smoke from the starters pistol rather than the sound of the pistol's ?ring. What would be the difference in time if they used sound? Show all work. 20. Herds of African elephants are generally Spread over large areas. Infrasonic sound waves (sound waves below the human range of frequency detection) are used by these elephants to locate each other and to communicate. Sound waves with low frequencies have a greater ability to bend around obstacles and generally carry further. Scientists have detected sound waves with frequencies as low as 13 Hz being produced by elephants. Assuming a Speed of sound of 350 mils, determine the wavelength of these sounds waves. Show your work. 21. Students went hiking in a canyon let out a holler which reflected off a nearby rocky cliff and was detected as an echo 1.30 seconds later. Determine the distance to the rocky cliffs. Assume a speed of sound of 344 mils. Show your work. 22. If the speed of sound is 330 mils, what wavelength does a sound of frequency 512 Hz have? Show your work.
