Sound of a given frequency leaves a loudspeaker and spreads out due to diffracti

Question

Sound of a given frequency leaves a loudspeaker and spreads out due to diffraction. The speaker is placed in a room that contains either air or helium. The speed of sound in helium is about three times as great as the speed of sound in air. In which room, if either, does the sound exhibit the greater diffraction when leaving the speaker? The greater diffraction occurs in the air-filled room, because the wavelength of the sound is smaller in that room. The greater diffraction occurs in the air-filled room, because the wavelength of the sound is greater in that room. The diffraction is the same in both rooms. The greater diffraction occurs in the helium-filled room, because the wavelength of the sound is smaller in that room. The greater diffraction occurs in the helium-filled room, because the wavelength of the sound is greater in that room.

Explanation / Answer

D. The greater diffraction occurs in the helium-filled room, because the wavelength of the sound is greater in that room This is because, greater the wavelength, better is the diffraction. Greater the velocity, greater the wavelength.

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