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Wave Speed
Speed and Medium for a Wave
School blocks YouTube? Download the file below | Onsite | | Mythbusters |
Video Instruction showmethephysics.com
F. Speed – the number of meters a single cycle travels per second
1. V = fλ
solve for f:
f = v/λ
inverse relationship
Wave Speed / Doppler Effect
2. Speed of wave depends on the medium
(slower in dense media)
Ex) f = 40. hertz. V = ?
(1) 13 m/s (2) 27 m/s (3) 60. m/s (4)120 m/s Jan 2002 Test
V = fλ
V = 40. Hz(1.5 m)
(3) 60. m/s
Ex) Period = 5.0 sec. V = 20. m/s Wavelength = ?
V = fλ
Need f????
T = 1/f
5.0 sec = 1/f
f = .20 Hz
V = fλ
20. m/s = (.20 Hz)λ
= 1.0 x 102 m
3. Velocity sound = 3.3 x 102 m/s
(Air, Reference Table, room temperature)
School Blocks YouTube? Use link below. Jet breaking speed of sound
School blocks YouTube? Download file below.
Velocity light in a vacuum
= 3 x 108
m/s
Wikimedia
About how many times faster
is
p. 1 Reference Table
About 1 million times
Gap between time you see lightning and time you hear thunder tells ....
... distance of lightning
If time gap is small?
Lightning is close
Large gap of time?
Lightning far away
Did you know ... Every 5 seconds gap = 1 mile '...you can approximate the storm's distance in miles by counting the seconds between the lightning and thunder and dividing by five. It takes about five seconds for the sonic boom to travel one mile, so if you see the sky illuminated by a streak of lightning and count 10 seconds until you hear the low rumble of the thunder, the storm is about two miles away.'
Vibrating Tuning Fork - Slow Motion
Drdanku YouTube Channel School blocks YouTube?
Wavelength, frequency, Which 3 are determined by the source of a wave?
frequency, period, amplitude.
©Tony
Mangiacapre., - All Rights Reserved
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