Physics, 30.08.2019 02:30 kaybreezy

Shelli is a student describing the resonance of a metal beam. she demonstrates that the sound dims when the beam is vibrated at a certain frequency.
what does she most likely say in response to the dimming sound?
a “this is not the natural frequency of the beam.”
b “this is the natural frequency of the beam.”
c “the decibels are increasing.”
d “the amplitude is not increasing.”

Answers: 2

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Shelli would most likely respond that A. "This is not the natural frequency.
Vibrations are strong at the resonance frequency and less at other frequencies. At natural frequency which is the resonant frequency, the sound created vibration is strong and lesser at other frequencies.

Answer from: carcamophillip

The correct answer is “This is not the natural frequency of the beam.”

Explanation:

Resonance is a phenomenon which occurs when the applied frequency on the object is equal to its natural frequency.

When resonance occurs the amplitude of the vibrating object becomes large.

Loudness depends on the amplitude. If the amplitude is low then the sound becomes softer. If the amplitude is large then the loudness will become more.

In the given problem, Shelli is a student describing the resonance of a metal beam. She demonstrates that the sound dims when the beam is vibrated at a certain frequency. She wants to say in response to the dimming sound that this is not the natural frequency of the beam.

As the dimming sound shows that the amplitude of the sound is low. But it cannot happen in the case of resonance.

Therefore, the correct option is A.

Answer from: Quest

Nucleus for question ome

Answer from: Quest

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.

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