Question

A plane wave is represented by x = 1.2 sin (314 t + 12.56 y) where x and y are distances measured along in x and y direction in meter and t is time in seconds. This wave has

• A. A wave length of 0.25 m and travels m + ve x-direction
• B. A wavelength of 0.25 m and travels in + ve y-direction
• C. A wavelength of 0.5 m and travels in – ve y-direction
• D. A wavelength of 0.5 m and travels in – ve x-direction

Answer 1

Answer: (C)

A wavelength of 0.5 m and travels in – ve y-direction

Answer 2

From given equation k = 12.56

$\lambda = \frac{2\pi}{k}$0.5 m direction = – y