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nekit [7.7K]
4 years ago
9

How many electrons in a hydrogen atom?

Physics
1 answer:
Ksenya-84 [330]4 years ago
4 0

Answer:

Explanation:

Hydrogen is the first element on the periodic table. That tells you there is 1 electron.

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The distance of an illuminated object from its light source is decreased to 1/3 while the luminous flux remains constant. Which
Nostrana [21]

Answer:

The illuninance being multiplied by 9

Explanation:

6 0
3 years ago
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An inductor is connected to a 26.5 Hz power supply that produces a 41.2 V rms voltage. What minimum inductance is needed to keep
alexira [117]

Answer:

The minimum inductance needed is 2.78 H

Explanation:

Given;

frequency of the AC, f = 26.5 Hz

the root mean square voltage in the circuit, V_{rms} = 41.2 V

the maximum current in the circuit, I₀ = 126 mA

The root mean square current is given by;

I_{rms} = \frac{I_o}{\sqrt{2} } \\\\I_{rms}  = \frac{126*10^{-3}}{\sqrt{2} }\\\\I_{rms}  =0.0891 \ A

The inductive reactance is given by;

X_l = \frac{V_{rms}}{I_{rms}} \\\\X_l= \frac{41.2}{0.0891}\\\\X_l = 462.4 \ ohms

The minimum inductance needed is given by;

X_l = \omega L\\\\X_l = 2\pi  fL\\\\L = \frac{X_l}{2\pi f}\\\\L = \frac{462.4}{2\pi *26.5}\\\\L = 2.78 \ H

Therefore, the minimum inductance needed is 2.78 H

7 0
3 years ago
Nl
Sedaia [141]

Answer:

10 mL= 0.01 L

Explanation:

V(water) = 20 mL

V(water + a marble) = 30 mL

V(marble) = V(water + a marble) - V(water) = 30 mL - 20 mL = 10 mL= 0.01 L

6 0
4 years ago
Help pls and thank you PLEASE NO LINKS
AveGali [126]

Answer: mutation

explanation: no other species of its kind will have this mutation

4 0
3 years ago
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______ Made geocentric model of the solar system using epicycles
stiks02 [169]

Answer:

Ptolemy made geocentric model of the solar system using epicycles

Explanation:

Ptolemy made geocentric model of the solar system using epicycles.

This model accounted for the apparent motions of the planets in a very direct way, by assuming that each planet moved on a small circle, called an epicycle, which moved on a larger circle, called a deferent.

Therefore, Ptolemy is the answer.

3 0
3 years ago
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