A periodic pulse travels a distance of 20.0m in 1.00s. If its frequency is 2.0 x 103Hz. Calculate the wavelength.
A
1.0 x 10-3m
B
1.0 x 10-2m
C
2.0 x 10-2m
D
1.0 x 102m
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Given: distance(d) = 20.0m. time(t) = 1secs, f = 2 x 10\(^3\)Hz, wavelength(\lambda) = ?
But v = \(\frac{s}{t}\) =20.0m/s = f\lambda
\lambda = \(\frac{\text{v}}{\text{\lambda}}\) = \(\frac{20}{2\times10^3}\) = 0.01m = 1.0 x 10\(^{-2}\)m
Source: Myschool Past Questions Archive (Record #33803)