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german
3 years ago
14

Write the letters of the correct answers on the lines at left.

Physics
1 answer:
LekaFEV [45]3 years ago
5 0

Answer:

The answer is letter D.

Explanation:

Electricity is the flow of electrons in a material in a specific direction. When we connect a differential potential between a conducting material, all valence electrons (the electrons which are in the outer shell of the electronic configuration of the atom) must move freely through the atom. This is the definition of a conducting material.

By the other hand in insulating materials, the valence electrons are bound tightly to their atoms, impeding the movement of the electrons due to the differential potential.

Therefore the answer will be letter <u>D</u>, electricity will flow if the electrons are bound loosely to their atoms in the material.  

I hope it helps you!

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A plane electromagnetic wave with wavelength 3.0 m, travels in free space in the+xdirection with its electric field vector~E, of
mart [117]

Answer:

    f =1 10⁸ Hz

Explanation:

The speed of an electromagnetic wave is given by

          c = Lam f

In our case, the wavelength is 3.0 m, so we can clear the frequency

         f = c / Lam

         f = 3 108/3.

         f =1 10⁸ Hz

6 0
3 years ago
how can changing the kinetic energy of an object cause energy to be transferred to or from the object
melisa1 [442]

Kinetic Energy. Energy is transferred from one object to another when a reaction takes place. Energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. For the blue ball to move to the position of the green ball, energy must be given to the blue ball.

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Does electrons have more mass than neutrons?
musickatia [10]

Answer:

No, neutrons have about the same mass as a proton, but both have more mass than electrons.

Hope this helps a bit,

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3 years ago
Which describes the greenhouse effect? 1. Earth continues to get warmer over time because it is slowly moving closer to the sun.
Alekssandra [29.7K]

Answer: The green house effect is best described by option 4 (Energy given off by earth is reflected off of earth's atmosphere back down to the surface).

Explanation:

The green house effect can be described as the energy given off by earth is reflected off of earth's atmosphere back down to the surface.

When energy from the sun passes through the atmosphere, some are absorbed which keeps the earth surface warm. While the rest is reflected back largely by cloud.

The energy which is emitted from the earth surface is called the infrared radiation. Some of the infrared radiation passess through the atmosphere but most is absorbed and re- emitted in all directions by the greenhouse gas molecules and clouds. This effect warms the earth surface and the lower atmosphere. Therefore this statement (Energy given off by earth is reflected off of earth's atmosphere back down to the surface) is correct about greenhouse effect.

For the greenhouse effect to occur, greenhouse gas molecules are mostly needed. Examples of these gases include:

--> Carbon dioxide (CO2),

--> Water vapor (H2O), and

--> Methane (CH4)

Over the years, the excessive human activities has lead to increase in the greenhouse gas molecules which has negatively affected the greenhouse effects.

6 0
3 years ago
Hii! help asap. i’ll give brainliest thanks!
o-na [289]

I believe it’s the mass of the box but I don’t no if I’m right

Hope this helped
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