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Anna11 [10]
3 years ago
8

Imagine a ringing bell set inside a sealed glass jar. Once all the air is removed and a vacuum is crated, the ringing sound is n

o longer heard. Explain why this happens.
A. The lack of air in the jar causes the ringing to stop.

B. Without air, the sound waves cannot travel to the ear.

C. The glass prevents any sound from scraping.

D. The pressure of outside air causes the sound to remain within the jar.
Physics
1 answer:
kenny6666 [7]3 years ago
5 0

working...

Sound wave needs medium to travel

as energy which travels in this wave is because of transfer from one particle to another particle

If there is no medium then energy can not be transferred and sound wave will not travel

so in vacuum we can not listen sound

similarly here air is removed it means there is no medium inside the jar to travel the sound and hence we can not hear it

Option B is correct

Without air, the sound waves cannot travel to the ear.

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AveGali [126]
Neutrons are neutral .. I mean there will be no change in the overall charge ..
Still there is indeed an increase in the overall energy of the atom ..
8 0
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When making a sound source near a reflective surface, such as making a person at a podium, the sound can reflect off of the surf
Liula [17]

Answer:

1. By removing the reflector or reflecting elements

2. By using absorbing material on the reflecting surfaces.

Explanation:

To solve problems caused by reflecting surfaces, you can remove the reflector or reflecting elements. However, sometimes it is enough to turn/move the reflecting element and change the reflections. Furthermore, using absorbing material on the reflecting surface can help reduce comb filtering as well.

In some cases, it is possible to place the sound source so close to the reflecting surface, that there is no suspension between the direct sound and the reflected sound.

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3 years ago
Should we focus on the p-value instead of the alpha level?
madreJ [45]

Answer:

Yes, we must focus on p-value along with the alpha level

Explanation:

Alpha and P values are provides two different set of information. While on one hand alpha values sets an extreme value set before rejecting the hypothesis, P value determines the extremeness of the values in the data set.  Thus, if p values is lesser than or equal to alpha value, the null hypothesis is rejected,  If p value is greater than alpha value, then the null hypothesis is not rejected.  

3 0
3 years ago
A train with proper length L has clocks at the front and back. A photon is fired from the front to the back. Working in the trai
tamaranim1 [39]

Explanation:

In train's rest frame, the speed of photon is c and the proper length of the train is L. The time taken by the photon to cross the train is t=\frac{L}{c}

In ground frame, the speed of the photon is given as follows:

v_{x}=\frac{v_{x}+v}{1+\frac{v_{x} \cdot v}{c^{2}}}

=\frac{c+v}{1+\frac{c v}{c^{2}}} \\=c

The speed of light or photon remains same in every frame of reference.

Now, the speed of train is very less as compared to the speed of photon so that v So that, \frac{v}{c} \ll 1

The length contraction in the ground frame is given as follows:

L^{\prime}=L \sqrt{1-\frac{v^{2}}{c^{2}}}

=L

Time taken by the photon to travel the length of the train in ground frame is .

7 0
3 years ago
At what height does a 1000-kg mass have potential energy of 1J relative to the ground?
Dvinal [7]

Answer:

0.0001 m

Explanation:

Given

M=1000 KG

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G=9.8 m/s

H=?

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H= PE/MG

H=1/1000x9.8

H= 1/9800

or 0.00010204

7 0
2 years ago
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