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dalvyx [7]
3 years ago
13

A geneticist looks through a microscope to determine the phenotype of a fruit fly. The microscope is set to an overall magnifica

tion of 400x with an objective lens that has a focal length of 0.60 cm. The distance between the eyepiece and objective lenses is 16 cm.
1) Find the focal length of the eyepiece lens assuming a near point of 25 cm (the closest an object can be and still be seen in focus). Do not neglect any values in your calculation. (Express your answer to two significant figures.)
Physics
1 answer:
guajiro [1.7K]3 years ago
6 0

Answer:

f_{e} = 1.7 cm

Explanation:

The magnification of the compound microscope is given by the product of the magnification of each lens

        M = M₀ m_{e}

        M = - L/f₀  25/f_{e}

Where f₀ and f_{e} are the focal lengths of the lens and eyepiece, respectively, all values ​​in centimeters

In this exercise they give us the magnification (M = 400X), the focal length of the lens (f₀ = 0.6 cm), the distance of the tube (L = 16 cm), let's look for the focal length of the eyepiece (f_{e})

         f_{e} = - L / f₀ 25 / M

Let's calculate

        f_{e} = - 16 / 0.6 25 / (-400)

        f_{e} = 1.67 cm

The minus sign in the magnification is because the image is inverted.

          f_{e} = 1.7 cm

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Answer: Hydrostatic equilibrium in the Sun means that pressure balances the weight of overlying layers.

Explanation: To find the answer, we have to know more about the Hydrostatic equilibrium in sun.

<h3>What is Hydrostatic equilibrium in sun?</h3>
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  • We can say that the forces that control the sun are precisely balanced.
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8 0
2 years ago
Which of the following are decomposition reactions?
zhenek [66]

The 2 decomposition reactions are:

B. K_{2}CO_{3} (s) --> K_{2} O (s) + CO_{2} (g)

C. 2SO_{3} (g) --> 2SO_{2} (g) + O_{2} (g)

Explanation:

Step 1:

A decomposition reaction is one in which a single compound breaks down into two or more products.

Step 2:

Let us examine each reaction if it satisfies the above rule.

A. 2 LiOH +  CO_{2} ---> Li_{2} CO_{3} + H_{2} O

In this reaction we have 2 reactants giving 2 products. Hence this is not a decomposition reaction.

B. K_{2} CO_{3} ---> K_{2} O + CO_{2}

In this reaction a single reactant potassium carbonate gives rise to 2 products Potassium Oxide and carbon-di-oxide. Hence this is a decomposition reaction

C. 2SO_{3} ---> 2SO_{2} + O_{2}

In this reaction a single reactant sulfur tri-oxide gives rise to 2 products sulfur di-oxide and oxygen. Hence this is a decomposition reaction.

D. 2Na + Cl_{2} ---> 2NaCl_{}

In this reaction 2 reactants sodium and chlorine gives rise to a single product sodium chloride. Hence this is not a decomposition reaction.

Step 3:

Answer:

The 2 decomposition reactions are:

B. K_{2} CO_{3} (s) ---> K_{2}O (s) + CO_{2} (g)

C. 2SO_{3} ---> 2SO_{2} + O_{2}

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A, the energy an object has due to its motion.

Explanation:

Kinetic energy is the energy created by motion.

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Answer:

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Pure water is considered to neutral and the hydronium ion concentration is 1.0 x 10-7 mol/L which is equal to the hydroxide ion concentration. So the pH is the -log of the [hydronium ion].

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