Question

For a stationary wave, `t = 8 sin ((pix)/(20)) cos (50 pit)`. What is the distance between two successive antinode ?
A. 15 cm
B. 20 cm
C. 25 cm
D. 30 cm

Answer 1

Correct Answer - b
`Y = 8 sin ((pix)/20) cos (50pit)`
`= 8 sin ((2pix)/40)cos (50pit)`
Comparing with the standard equation, we get,
`(2pix)/(lambda) = (2pix)/40`
`therefore = lambda = 40` cm
`therefore` Distance between two sucessive antinodes
`= lambda/2 = 20` cm