1. AM radio signals have frequencies between 550 kHz and 1600 kHz and travel with the speed of light (c = 3x108 m/s). What are the wavelengths of these two extreme frequency signals? m Mongest m (note: smallest freq) shortest
1. AM radio signals have frequencies between 550 kHz and 1600 kHz and travel with the speed of light (c = 3x108 m/s). What are the wavelengths of these two extreme frequency signals? m Mongest m (note: smallest freq) shortest
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Can you help me with number 1 please
Transcribed Image Text:Physics 141
2003
Worksheet Chapter 16 (due Wed 6/1, noon)
Name: Adosa Moz Box#: 25
1. AM radio signals have frequencies between 550 kHz and 1600 kHz and travel with the speed
of light (c = 3x108 m/s). What are the wavelengths of these two extreme frequency signals?
λ shortest
m
Mongest
m (note: smallest freq)
2. A cord of mass 0.55 kg is stretched between two supports 30 m apart. The tension in the cord
is 150 N.
=90.45
(a) Determine the speed of wave pulses on the cord. v =
m/s (Eq. 16-3)
(b) How long does it take a pulse to travel from one end to the other? 0,33 $ S
(c) By what factor is the speed increased if the tension is doubled? v2 = √2 XVI
(d) By what factor is the speed decreased if two such cords are twisted together so that the mass
per unit length is doubled? V2 =
X VI
3. A guitar string is L = 90 cm long and has a mass of 3.6 g. The distance from the bridge to the
support post is l = 62 cm, and the string is under a tension of 520 N. What are the frequencies of
the fundamental and first two overtones?
(a) Sketch the string oscillating in the fundamental and first two overtones.
n = 1
n=2
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