Question

you may hear and recognise the voice of your friend behind the wall on account of
1.diffraction and loudness
2.interference and quality
3. diffraction and quality
4.interference and pitch

which is correct​

Answer 1

1)diffraction and loudness

Answer 2

Option 1.diffraction and loudness

• In these situations, diffraction enables the sound to "bend around" the obstructions.
• As shown by the example of a marching band on the street, the fact that diffraction is more evident with longer wavelengths suggests that you can hear low frequencies around obstacles better than high frequencies.
• The fact that sound waves have a far higher wavelength than visible light waves accounts for why the diffraction of sound waves is more obvious in day-to-day experience than light waves.
• The wavelength of the light or sound waves should be equivalent to the slit width for diffraction to take place.
• The wavelength and size of the object both affect how much the wave is diffracted (spread or bent).

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