Which of the following is the most likely to result in an acoustic shadow?

A) a sound wave encounters an object that is larger than the wave length of the sound
B) a sound wave encounters an object that is smaller than the wavelength of the sound
C) the choices are all equally likely to create an acoustic shadow
D) a sound wave encounters an object that is the same size as the wavelength of the sound.

Option A) a sound wave encounters an object that is larger than the wave length of the sound

Explanation:

An acoustic shadow is formed when a sound wave of low wavelength (higher frequency) is unable to diffract (bend around) large physical objects such as building structures. This lessens the rate of travel of sound, and low sound is heard on the other side.

Option A.

A sound wave encounter an object that is larger than the wave length of the sound.

Explanation:

Acoustic shadow refers to an area a sound wave cannot propagate or sound from a close source cannot be heard due to topographical obstructions that is through a process of wind currents, building or sound. This occur when sound waves fail to spread due to physical barriers. It occur when sound encounter wavelength that is larger than the sound.