Waves, Superposition, Optics and Doppler Effects
Question 1 of 30
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A progressive wave is described by \(y(x,t)=0.004\cos(80\pi t-20\pi x)\), where \(x\) is in m and \(t\) is in s. What is the wave speed and the direction of propagation?
Select one option.
A
\(v=2\,\text{m s}^{-1}\), travels in the \(-x\) direction
B
\(v=4\,\text{m s}^{-1}\), travels in the \(+x\) direction
C
\(v=4\,\text{m s}^{-1}\), travels in the \(-x\) direction
D
\(v=2\,\text{m s}^{-1}\), travels in the \(+x\) direction
E
\(v=1\,\text{m s}^{-1}\), direction cannot be determined
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