Two Small Identical Speakers Are Connected (In Phase)to the Same

question 56

Multiple Choice

Two small identical speakers are connected (in phase) to the same source.The speakers are 3 m apart and at ear level.An observer stands at X, 4 m in front of one speaker as shown.If the amplitudes are not changed, the sound he hears will be least intense if the wavelength is:

• A)1 m
• B)2 m
• C)3 m
• D)4 m
• E)5 m

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Definitions:

Integration

Summing up of excitatory and inhibitory signals by a neuron or by some part of the brain.

Ciliary Muscle

Within the ciliary body of the vertebrate eye, the ciliary muscle controls the shape of the lens.

Iris

Muscular ring that surrounds the pupil and regulates the passage of light through this opening.

Pupil

Opening in the center of the iris of the vertebrate eye.