Question

where a sensor registers the second maximum of a sound pattern with a frequency equal to 400 Hz that passes through a 1.80m wide door. The speed of sound is 3.45 m / s

the speed of sound is 345 m/s

select the correct answer

a.28.54 degrees

b.13.86 degrees

c.18.79 degrees

d. 40.12 grados

Answer 1

This phenomenon is known as Diffraction, which is the bending of a wave ( either light or sound ) the corners of a obstacle or aperture. To observe this, the obstacle must be very small, comparable with the wavelength of the wave.

For Secondary Maximum, the angle of wave deflection,

For FIrst Secondary Maximum,     

But,    Wavelength

Given, and

GIven, width or size of the aperture ,

Substituting the values of and   in

Converting radian to Degrees    .......... Option D