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Vladimir [108]
3 years ago
6

Solar panels convert light energy from sunlight into electrical energy. What material is most likely used in solar panels, and w

hy?
A.) A nonmetal is used because it is a semiconductor and can become more conductive when more light shines on it.

B.) A metalloid is used because it is a good conductor but can become less conductive when more light shines on it.

C.) A metalloid is used because it is a semiconductor and can become more conductive when more light shines on it.

D.) A nonmetal is used because it is a poor conductor but can become more conductive when more light shines on it.

____________________________________

Which properties are characteristic of metalloids?

A.) high electrical conductivity and a high melting point

B.) low electrical conductivity and a low melting point

C.) intermediate conductivity and a high melting point

D.) intermediate conductivity and a low melting point
Physics
1 answer:
Art [367]3 years ago
6 0
<span>C.) A metalloid is used because it is a semiconductor and can become more conductive when more light shines on it.
Nonmetals do not conduct energy any way and you want the metalloid to be conductive so it can provide you with energy. 


</span><span>C.) intermediate conductivity and a high melting point
</span>It conducts electricity fairly well.

Hope this helps. 

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Answer:

The velocity at impact is 222.2 m/s

Explanation:

The given information are;

The time at which the woman heard the sound of the coin after dropping it into the wishing well = 30 seconds

The average speed of sound in air = 344 m/s

The time in which the dime travel = t₁

The time in which the sound travel = t₂

1/2 × 9.8 × t₁² = 344 × t₂

t₁ + t₂ = 30

4.9·t₁² = 344 × (30 - t₁)

4.9·t₁² + 344·t₁ - 10320 = 0

Which gives -344±

t_1 = \dfrac{-344\pm \sqrt{344^{2}-4\times 4.9 \times 10320}}{2\times 4.9}

t₁  = 22.676 seconds or -92.9 seconds

Therefore the correct natural time is t₁  = 22.676 seconds

The velocity at impact, v = g×t₁ = 9.8 × 22.676  = 222.2 m/s

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Answer:

Terminal velocity is achieved, therefore, when the speed of a moving object is no longer increasing or decreasing; the object's acceleration (or deceleration) is zero.

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hope it helps you

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