Looking at this simple light problem

[qazxsw11111]

Homework Statement

Hi everyone! This question is very simple, but I just cannot think of anything to explain it.

The question is: A pillar in a concert hall can block the view of the audience but it has little effect on their hearing. Why?

1)Light is a transverse wave while sound is a longitudinal wave.
2)Light is a EM wave but sound is a pressure wave.
3)Light has a smaller/larger (cant remember) wavelength compared to sound.
4)Light travels faster than sound.


All the options are tricky for me but I still put 2 as it is instinct (somewhat, but still no sense whatsoever). However, the answer is wrong and I still do not know the answer.

Anyone help?

Thanks.

 

[Doc Al]

What determines how light--or any other wave--bends around an obstacle? (Look up diffraction.)

 

[qazxsw11111]

Ok...So diffraction. The longer the wavelength, the more it diffracts right? So sound has a longer wavelength?

 

[Doc Al]

The longer the wavelength, the more it diffracts right?

Right.

So sound has a longer wavelength?

I'm not telling! Look up the typical wavelengths for visible light and for sound. Compare.