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2 years ago

Wood, plastic, rubber and air are good insulators because

Physics

2 answers:

ruslelena [56]2 years ago

7 0

Answer: c) they don’t have free electrons.

Explanation: Wood, plastic, rubber, and air are good insulators because, obviously, they are bad conductors.

This is because the do not have a lot of free electrons, so when you apply an electric field, the total flow of electrons (or electricity) is almost zero.

In the same case, when charges try to flow into these materials (by connecting a wire to a piece of wood or something like that), there are no free electrons inside of the material, so the electrons that try to move inside the material see a lot more of obstacles against their movement.

Then the correct option is option c: they don’t have free electrons.

antiseptic1488 [7]2 years ago

6 0

Wood, plastic, rubber and air are good insulators because they don’t have free electrons.

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2 years ago

Our Sun emits most of its radiation at a wavelength of 550 nm. If a star were 3.50 times hotter than our Sun, it would emit most

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The wavelength of the radiation emitted by the star is 183 nm.

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As per Wien's displacement law, the product of emitted wavelength and temperature of the star will be equal to 2.898 × 10⁻³ mK.

$T*wavelength = 2.898 * 10^{-3}$

So if the wavelength of the emitted radiation by Sun is given as 550 nm, then the temperature of the Sun will be

$Temperature of Sun = \frac{2.898*10^{-3} }{wavelength}$

$Temperature of Sun = \frac{2.898*10^{-3} }{550 * 10^{-9} } = 5.27 * 10^{3} K$

Then if the temperature of star is said to be 3.5 times hotter than Sun, then the temperature of Star = 3.5×5.27×10³ = 15.81×10³ K.

With this temperature, the wavelength of the emitted radiation can be found as follows:

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So, the wavelength of the radiation emitted by the star is 183 nm.

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2 years ago

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topjm [15]

Answer:

Option B seems to be the appropriate choice,

Explanation:

The given question is incomplete. Please find the attachment of the complete question.

From either the principle or law of the Coulombs, there would have been either pressure (force) through attachment or repulsion amongst charges.
It is evident from the analysis presented that perhaps the bee becomes positively (+) charged and would have been drawn either by negatively (-) charged roots of the plants or stem.

As a consequence, the vegetation is electric current polarized because as activated bee pursued.

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vekshin1

The region under the speed time chart gives the relocation.

In simple to-recall, straightforward terms, remove levels with the result of speed and time. So when you discover the region under a speed time diagram, you are really increasing speed and time. This gives the separation.

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