Question

If someone is a few doors down the hall in a different room and the doors are open, what is the main reason you can hear them speaking but can’t seem them?

A) Sound travels farther in air than light does.

B) Sound can travel through walls, but light cannot

C) The sound waves will diffract through the doorways, the light waves will not

D) Sound waves reflect off walls, but light cannot

E) Invisible biofluorescent fish eat the light

Answer 1

For the waves, the diffraction occurs when the size of the obstacle is comparable to the wavelength of the wave source.

The wavelengths of audible sound waves in air are comparable to the size of windows and doors of the rolms.

As a result, the sound waves diffract throuhh the doorways and travel paths which are not rectilinear. On the other hand, the light waves being too small in wavelengths in comparison with the door size, would be blocked completely.

Thus, option C is correct.