- #1

Saptarshi Sarkar

- 99

- 13

I do not understand why. I know that for an acoustic wave, the standing wave causes the density to change at different locations, making it lower at the antinodes and higher at the nodes. So, the antinodes act as slits.

But, from what I know, the distance between two antinodes is half the wavelength of the wave, so the grating element should also be half the wavelength. Can someone please help me understand this.