Question

The equation of a progressive wave is $y=0.002\sin 2\pi (2t-0.01x)$. Its wavelength is

• A. $100units$
• B. $10units$
• C. $200units$
• D. $20units$

Answer 1

Answer: (A)

$100units$

$y=0.002\sin (4\pi t-0.01\times 2\pi x)$
$k=0.01\times 2\pi$
$\lambda =\frac{2\pi }{k}$
$=100units$