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A sinusoidal wave has an amplitude of 3cm. Time period is 1s. The wavelength is 1cm. And at x = 0, t=0 the particle is at its mean position & moving upwards. What is the equation of the wave if it is travelling along the positive x-axis?
  • a)
    y = 3sin(2πx – 2πt)
  • b)
    y = 3sin(2πt – 2πx)
  • c)
    x = 3sin(2πt – 2πy)
  • d)
    y = 3cos(π + 2πt – 2πx)
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A sinusoidal wave has an amplitude of 3cm. Time period is 1s. The wave...
The equation for a sinusoidal wave is given by:

y(x, t) = A sin(kx - ωt)

where:
y(x, t) is the displacement of the wave at position x and time t,
A is the amplitude of the wave,
k is the wave number,
x is the position along the wave,
ω is the angular frequency,
t is the time.

Given that the amplitude A = 3cm, time period T = 1s, wavelength λ = 1cm, and at x = 0, t = 0 the particle is at its mean position, we can find the values of k and ω:

k = 2π / λ = 2π / 1 = 2π cm^(-1)
ω = 2π / T = 2π / 1 = 2π rad/s

Therefore, the equation for the sinusoidal wave is:

y(x, t) = 3 sin(2πx - 2πt)

At x = 0, t = 0:

y(0, 0) = 3 sin(0) = 0

So, at x = 0, t = 0, the particle is at its mean position.
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Community Answer
A sinusoidal wave has an amplitude of 3cm. Time period is 1s. The wave...
The wave number k = 2π/1 = 2π.
The angular frequency w = 2π/1 = 2π.
The particle at x=0, t=0 is moving up from its mean position, & the wave travels towards the positive x-axis so the equation will be:
y = 3sin(2πt – 2πx).
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A sinusoidal wave has an amplitude of 3cm. Time period is 1s. The wavelength is 1cm. And at x = 0, t=0 the particle is at its mean position & moving upwards. What is the equation of the wave if it is travelling along the positive x-axis?a)y = 3sin(2πx – 2πt)b)y = 3sin(2πt – 2πx)c)x = 3sin(2πt – 2πy)d)y = 3cos(π + 2πt – 2πx)Correct answer is option 'B'. Can you explain this answer?
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