Q. The equation of a wave travelling in a string can be written as $y = 3\cos{\pi(100t - x)}.$ Its wavelength is
A) $100\ cm$
B) $2\ cm$
C) $5\ cm$
D) None of the above
Explanation
(b) Comparing the given equation with $y = a\cos{(\omega t - kx)}$
We get $k = \frac{2\pi}{\lambda} = \pi \Rightarrow \lambda = 2cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.