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

B

Physics & Space Science

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Use the band theory of semiconductors to choose the most correct statement below

a. A semiconductor primarily differs from an insulator in size of band gap. b.Materials that are generally called conductors contain an overlap in the conduction and valence bands. c. Conductors and semimetals are similar in band structure because of large band gaps. d. Electrons in insulators at room temperature can easily cross the band gaps. e. Semimetal materials are arranged structurally like metals but act as insulators because they have large band gaps.

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What do we mean by time dilation in relativity?

A) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone. B) It is the idea that relativity makes time dilate, or expand, for people who study it. C) It is a hallucinogenic effect experienced by people who take too much of something. D) It is the idea that time really runs slower in reference frames moving relative to you.

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Take a cup of water, add sugar, and stir. If the resulting solution no longer contains sugar crystals, the solution is said to be

a. an unsaturated solution. b. a saturated solution. c. a heterogeneous solution. d. none of these.

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Physics & Space Science

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Kinetic energy __________ conserved

Fill in the blank(s) with correct word

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Physics & Space Science