Which wave pulse below carries the most energy? Explain your reasoning. A wave o
ID: 1454124 • Letter: W
Question
Which wave pulse below carries the most energy? Explain your reasoning. A wave on a rope travels with a speed of 10 m/s. The length of the rope is 5 m, and the tension in the rope is 25 X. What is the rope's mass 20 kg 18.5 kg 16 kg 12.5 kg 10 kg You stand at x = 0, listening to a sound that is emitted at a source frequency f The graph below shows the frequency that you hear during a 4 s interval. Which one of the following describes the motion of the source? It moves from left to right and pastes you at t = 2 s. It moves from right to left and passes you at t = 2 s. It moves toward you, doesn't reach you, and reverses at t = 2 s. It moves away tom you and reverses at t = 2 s. It is stationary until t = 2 s. Then it moves toward you. If a whisper has an intensity of 1 Times 10 W/m^2 at a distance of 1 m from the source, what is the intensity 2 m from the source? Assume the sound propagates as a spherical wave. If a whisper has an intensity of 1 Times 10 W/m^2 at a distance of 1 m from the source, what is the power on a wave front 2 m from the source? Assume the sound propagates as a spherical wave.Explanation / Answer
15)
Given that
A wave on the rope travels with a speed (v) =10m/s
Length of the rope is (L) =5m
Tension in the rope (T) =25N
Then mass of the rope is given by
v =Sqrt(T/(m/L)
v2 =T/(m/L)
Then mass m =T*L/v2 =25N*5m/(10m/s)2 =125/100=1.25kg
17)
We know that
Intensity =power/Area =p/4pir2
Therefore I is inversely proportional to r2
I1/I2 =(r2/r1)2 =1*1010W/m2/I2 =(2m/1m)2 =4
I2 =1*1010W/m2/4 =0.25*1010W/m2
18)
We know that
Intensity =power/Area =p/4pir2
Therefore I is inversely proportional to r2 and
The power of the wave at 2m is given by
P =Intensity *area =(1*1010W/m2)(4*3.14*(2)2) =50.24*1010W/m2
I2 =1*1010W/m2/4 =0.25*1010W/m2
14)
The third pulse, because the amplitude of the particle is more
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