Two Loudspeakers S₁ and S₂, 3

question 69

Multiple Choice

Two loudspeakers S₁ and S₂, 3.0 m apart, emit the same single-frequency tone in phase at the speakers. A listener directly in front of speaker S₁ notices that the intensity is a minimum when she is 4.0 m from that speaker (see figure) . The listener now walks around speaker S₁ in an arc of a circle, staying 4.0 m from that speaker but increasing her distance from the other speaker. How far is she from speaker S₂ when she notices the first maximum in the sound intensity? The speed of sound in air is 340 m/s.

• A) 4.5 m
• B) 5.0 m
• C) 5.5 m
• D) 6.0 m
• E) 6.5 m

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Definitions:

Codons

Sequences of three nucleotides in mRNA that specify the addition of a specific amino acid into a polypeptide chain during protein synthesis.

Anticodons

The three-nucleotide sequences on tRNA that are complementary to the codons on mRNA, important for the translation phase of protein synthesis.

mRNA

Messenger RNA (mRNA) is a type of RNA that conveys genetic information from DNA to the ribosome, where it specifies the amino acid sequence of the protein products of gene expression.

tRNA

Transfer RNA; a type of RNA molecule that helps decode a messenger RNA (mRNA) sequence into a protein during protein synthesis.