Question

Two small loudspeakers emit sound waves of the same amplitude and frequency in phase with each other. The waves produce an interference pattern such that the distance from the right bisector to a point P on the third nodal line is x3. The wavelength of the sound is increased by a factor of 4. What is the new distance?

1) 1/4 x3
2) x3
3) 4 x3
4) 8 x3

Answer 1

again, what is "right bisector"? How can wavelength be increased?

Answer 2

This is the multiple choice given to me. I was stuck too. Any idea what would be the answer from 4 multiple choice

Answer 3

If the wavelength is quadrupled, so is the spacing. Increase wavelength by decreasing frequency.