Answer:
Option B
Explanation:
As we know phase difference is equal to
[tex]\psi = \frac{2\pi }{\lambda} * \Delta[/tex] ----Eq (1)
where
[tex]\Delta[/tex] is the physical difference between two points = 0.025 m
[tex]\lambda[/tex] is equal to [tex]\frac{v}{f}[/tex]
[tex]\lambda = \frac{20}{100} = 0.2[/tex]
Substituting the given values in above equation, we get -
[tex]\psi[/tex] =
[tex]\frac{2\pi }{0.2} *0.025\\\frac{\pi }{4}[/tex]
Hence, option B is correct
