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Dafna11 [192]
1 year ago
6

Hello people ~Sound cannot travel through(a) air(b) water(c) air(d) vacuum​

Physics
2 answers:
SVETLANKA909090 [29]1 year ago
7 0

Answer:

Vaccum

Explanation:

  • Sound travels through the particles of different matter
  • In vaccum there is no air so no matter and so no particles .
  • So sound can't travel through vaccum.

You can test it .

  • Take a speaker and keep it inside a bottle ,close it .
  • You won't hear any sound
myrzilka [38]1 year ago
5 0

Answer:

Option D. Vacuum

Explanation:

Sound cannot travel through vacuum

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two electrons are an angstrom (1x10^-10m) apart. What electrostatic force do they exert on one another?
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Answer:

2.30 × 10⁻⁸ N if the two electrons are in a vacuum.

Explanation:

The Coulomb's Law gives the size of the electrostatic force F between two charged objects:

\displaystyle F = -\frac{k\cdot q_1 \cdot q_2}{r^{2}},

where

  • k is coulomb's constant. k = 8.99\times 10^{8}\;\text{N}\cdot\text{m}^{2}\cdot\text{C}^{-2} in vacuum.
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  • r is the distance between the two objects.

For the two electrons:

  • q_1 = q_2 = 1.60\times 10^{-19}\;\text{C}.
  • r = 1\times 10^{-10}\;\text{m}.
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Answer: 0.091 m

Explanation:

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m = mass of Uranium -238 ion = 238 * amu = 238 * 1.6*10^-27 kg

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e = charge of the Uranium -238 ion = 1.6*10^-19 C

r = 1/1.29 * √[(2 * 238 * 1.6*10^-27 * 2900) / 1.6*10^-19]

r = 1/1.29 * √(2.21*10^-21 / 1.6*10^-19)

r = 1/1.29 * √0.0138

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Therefore, the radius of their circular path is 0.091 m

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