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3 years ago

Explain how electrons use light energy to move among energy levels within an atom.

Physics

1 answer:

pashok25 [27]3 years ago

7 0

Answer:

explained

Explanation:

Electrons use light energy to move among energy levels within an atom because of the following reason

Electrons in each orbit around an atom have some specific energy. However, they can emit or absorb photons of the energy equal to difference of the energy between these specific energy levels within an atom. If the electron absorbs an photon, it can move up the energy level, if the electron emits a photon, it can move down to a energy level.

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Which characteristic should a good scientific question have?

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What is the mass of a baseball that has a kinetic energy of 105 J and is traveling at 10 m/s?

kkurt [141]

Answer:

$\boxed {\boxed {\sf 2.1 \ kilograms}}$

Explanation:

Kinetic energy is the energy an object possesses due to motion. The formula 1/2 the product of mass and the squared velocity.

$E_k=\frac{1}{2} mv^2$

We know the baseball's kinetic energy is 105 Joules. It is also traveling at a velocity of 10 meters per second. `

First, convert the units of Joules to make unit cancellation easier later in the problem. 1 Joule (J) is equal to 1 kilogram square meter per square second (kg*m²/s²). The baseball's kinetic energy of 105 J is equal to 105 kg*m²/s².

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$105 \ kg*m^2/s^2= \frac{1}{2} m (10 \ m/s)^2$

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$105 \ kg *m^2/s^2 = m (\frac{1}{2} * 100 \ m^2/s^2)$

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The variable, m, is being multiplied by 50 square meters per square second. The opposite of multiplication is division, so we divide both sides by that value.

$\frac {105 \ kg *m^2/s^2 }{50 \ m^2/s^2}= \frac{ m (50 \ m^2/s^2)}{50 \ m^2/s^2}$

$\frac {105 \ kg *m^2/s^2 }{50 \ m^2/s^2}= m$

The units of square meter per square second will cancel out.

$\frac {105 }{50} \ kg= m$

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The mass of the baseball is <u>2.1 kilograms. </u>

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