Two In-Phase Loudspeakers That Emit Sound with the Same Frequency

question 138

Multiple Choice

Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m.A person is standing 12.0 m away from the wall,equidistant from the loudspeakers.When the person moves 3.00 m parallel to the wall,she experiences destructive interference for the second time.What is the frequency of the sound? The speed of sound in air is 343 m/s.

• A)278 Hz
• B)422 Hz
• C)452 Hz
• D)562 Hz
• E)694 Hz

Identify the role of structural conditions and cultural attributes in shaping the economic success of ethnic groups.

Examine the scientific critique of biological determinism and the myth of race.

Acknowledge the use of racial and ethnic identities in personal and societal contexts.

Understand the influence of historical and contemporary factors on racial and ethnic dynamics.