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NNADVOKAT [17]
2 years ago
8

Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n1, the middle has

n2 and the bottom one has n3. If n1 > n2 > n3, and if a ray of light strikes the top layer at an angle of incidence, in which layer is the angle of refraction the greatest? Why?
a. the bottom layer
b. the top layer
c. Once the ray enters the touching layers, the angle of refraction remains constant.
d. the middle layer

Physics
1 answer:
serg [7]2 years ago
7 0

Answer:

a. the bottom medium

Explanation:

it has the least index of refraction and hence most rarer.

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Answer:

Length of copper wire, l = 785 meters

Explanation:

Given that,

Resistance of the copper wire, R = 0.172 ohms

Area of cross section, A=7.85\times 10^{-5}\ m^2

Resistivity of copper, \rho=1.72\times 10^{-8}\ \Omega-m

The resistance of a wire is given by :

R=\rho\dfrac{l}{A}

l=\dfrac{RA}{\rho}

l=\dfrac{0.172\ \Omega\times 7.85\times 10^{-5}\ m^2}{1.72\times 10^{-8}\ \Omega-m}

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So, the length of the copper wire is 785 meters. Hence, this is the required solution.

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A small light cylinder and a large heavy cylinder are released at the same time and roll down a ramp without slipping. Which one
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C. Both reach the bottom at the same time.

Explanation:

For a rolling object down an inclined plane , the acceleration is given below

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For cylindrical object

k² / r² = 1/2

acceleration =  g sinθ  /( 1 + 1/2 )

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Since it does not depend upon either mass or radius , acceleration of both the cylinder will be equal . Hence they will reach the bottom simultaneously.

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Starting at point 0, you travel 500 m on a straight road that slopes upward at a constant angle of 5 degrees. What is your heigh
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Answer:

43.58 m

Explanation:

If you travel 500 m on a straight road that slopes upward at a constant angle of 5 degrees

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Therefore, the height above the starting point is equal to 43.58m

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