An automobile owner notices that when her car is outfitted with a muffler, the sound from the exhaust pipe is much quieter than without the muffler. When she asks her automobile technician about how a muffler works, he explains that a muffler is a device that matches the sound coming down the exhaust pipe but with waves out of phase from the pipe. What phenomenon is the automobile noticing and the technician describing?

A) Seismic shift
B) Doppler effect
C) Destructive interference
D) Constructive interference

D (Constructive interference)

Explanation:

Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes.

true is the correct answer

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the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.