Q 11-14-006NEETJEE MainEasy
For the wave $y = 5\sin 2\pi\left(\dfrac{t}{0.04} - \dfrac{x}{40}\right)$, with $x$ and $y$ in cm and $t$ in s, the wavelength and frequency are
Answer: (B) $40$ cm and $25$ Hz
Concept. Compare with $y = A\sin2\pi\left(\dfrac{t}{T} - \dfrac{x}{\lambda}\right)$.
Step 1. Read off. $\lambda = 40$ cm and $T = 0.04$ s.
Step 2. Frequency. $f = \dfrac{1}{0.04} = 25$ Hz.
Answer. $40$ cm and $25$ Hz (Option B).
Solution by Sreeraj P, M.Sc Physics