The figure shows two point sources of light, A and B. B emits light waves that are +π radians out of phase with the waves from A. A is 3λ from P. B is 5λ from P. (λ is the wavelength.) The phase difference between waves arriving at P from A and B is
A) 0 rad.
B) π rad.
C) 2π rad.
D) 3π rad.
E) 4π rad.

Question

The figure shows two point sources of light, A and B. B emits light waves that are +π radians out of phase with the waves from A. A is 3λ from P. B is 5λ from P. (λ is the wavelength.) The phase difference between waves arriving at P from A and B is 
A) 0 rad. 
B) π rad. 
C) 2π rad. 
D) 3π rad. 
E) 4π rad.

Quizplus · Accepted Answer

The Answer of The figure shows two point sources of light, A and B. B emits light waves that are +π radians out of phase with the waves from A. A is 3λ from P. B is 5λ from P. (λ is the wavelength.) The phase difference between waves arriving at P from A and B is 
A) 0 rad. 
B) π rad. 
C) 2π rad. 
D) 3π rad. 
E) 4π rad.

The Figure Shows Two Point Sources of Light, a and B