Answer:

Explanation:
As we know that volume of cylinder is

Where v=volume , h= height or thickness and r= radius
Here,

Putting these values in the previous equation , we get

Therefore thickness is 27.5 m
The speed of sound at

is approximately v=343 m/s. The distance covered by the sound wave is

And the time it takes is

Now we want to find how far the light travels during this time. Light travels at speed

, therefore the distance it covers during this time is
Answer:
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Explanation:
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Answer:
chemical energy is converted to electrical energy in a voltaic cell.
Answer:
An atomic nucleus is positively charged because it is composed of protons.
Explanation:
Protons are positively charged
Neutrons are neutral
Electrons are negatively charged