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aksik [14]
3 years ago
5

The different phases of the moon are caused by the moons near 28-day

Biology
1 answer:
MrRissso [65]3 years ago
6 0

Answer:

28 day orbit around Earth.

Explanation:

This is called the Lunar phase. The lunar phase or phase of the Moon is the shape of the directly sunlit portion of the Moon as viewed from Earth.

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1. What is the total magnification of an object if the ocular lens magnification is 20x and the objective lens magnification is
V125BC [204]

1. Answer: 900x

A typical microscope has two lens: ocular lens which located near the eye, and objective lens which located near the object. The image will undergo magnification of both lens. The total magnification of the object would be the product of both lens multiplication, not the sum. The multiplication will be: 20x * 45x= 900x

total mag= ocular * object

total mag= 20x * 45x

total mag= 900x


2.  Answer: 100x

The total magnification of the object would be the product of both lens multiplication. If the total magnification 1000x, that mean it was the product of ocular lens and objective lens. If ocular lens magnification is 10x, objective lens magnification would be:

total mag= ocular * object

1000x= 10x*object

object=1000x/ 10x=

object=100x

3. Answer: 0.2 mm

The area of the microscope that can be viewed by the eye should be the same. But since the magnification is different, the actual area that it represent will be different. Microscope with bigger magnification will have smaller diameter of the field of view(DFV).  Remember that micrometer(μm) is 1/1000 of millimeter(mm). The DFV would be:500 μm/ ( 1000x/400x)= 200μm= 0.2 mm


4. Answer: 750μm

This question is similar to number 3 question. Remember that 1 millimeter(mm) equal to 1000 micrometer(μm) .

The DFV of a 10x objective lens is 3 mm. Then the DFV of 40x lens would be:

DFV2= DFV1/ (mag1/mag2)

DFV2= 3mm/ ( 40x/10x)= 0.75 mm= 750μm

5. Answer: 125μm x 37.5μm

The lens DFV of microscope from question 4 is 750μm, so the width and length of the area would be 750μm.

If 6 organisms could fit across the DFV if they were laid end-to-end, the length would be: 750μm/ 6 organism= 125μm

If 20 organism could fit is stacked side by-side, then the width would be: 750μm/ 20 organism= 37.5μm

6. Answer: 6mm

This question is similar to number 3 and number 4 question. Remember that 1 millimeter(mm) equal to 1000 micrometer(μm).

The DFV of a 100x objective lens is 1.5 mm. Then the DFV of 25x lens would be:

DFV2= DFV1/ (mag1/mag2)

DFV2= 1.5mm/ (100x/25x)= 6 mm


7.Using the 100x objective lens from question 6, you estimate 12 organisms could fit across the DFV if they were laid end-to-end and 30 could fit is stacked side-by-side. What is the length and width of this organism (in microns)?  

Answer: 0.5mm x 0.2mm or 500μm x 200μm

The lens DFV of microscope from question 6 is 6 mm, so the width and length of the area would be 6 mm.

If 12 organisms could fit across the DFV if they were laid end-to-end, the length would be: 6mm/ 12 organism=0.5mm

If 30 organism could fit is stacked side by-side, then the width would be: 6mm/ 30 organism= 0.2mm

6 0
3 years ago
The Clean Air Act would be a reason for the Environmental Protection Agency (EPA) to regulate car emissions. Please select the b
KiRa [710]

The EPA is an independent agency formed for environmental protection. Hence the statement The Clean Air Act would be a reason for the Environmental Protection Agency (EPA) to regulate car emissions is true.

Car emissions are very harmful for all the living organisms in an environment.

8 0
3 years ago
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Where does the exchange of oxygen (from the air) with carbon dioxide (from the cells) take place?
Katen [24]

<u>Answer:</u>

The Answer is <em><u>Option D. </u></em>

<em>Exchange of respiratory gases, oxygen and carbon dioxide take place in the alveoli of the lungs. Oxygen which is inhaled from the atmosphere diffuses through the walls of the alveoli and reaches to the adjacent capillaries into the red blood cells.</em>

<em />

8 0
2 years ago
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Which of the following is a likely effect of the tornado on the plains ecosystem?
inn [45]

Answer:

Flying debris could harm a population of bison

5 0
3 years ago
Don marquis thinks abortion is almost always wrong because (most) fetuses ___________________.
myrzilka [38]

Don marquis thinks abortion is almost always wrong because (most) fetuses loose a bright and valuable future.

<h3>What is Abortion?</h3>

The term "abortion" refers to the removal or evacuation of an embryo or fetus in order to end a pregnancy. Miscarriages, also known as "spontaneous abortions," are abortions that take place naturally and happen in 30% to 40% of pregnancies. An induced abortion, or less frequently "induced miscarriage," is when pregnancy is intentionally ended. Abortion, when used without modification, typically refers to an induced abortion.

Induced abortion is one of the safest medical treatments when performed correctly. The probability of maternal death in the US is 14 times lower following an induced abortion than following childbirth. Unsafe abortions—those carried out by practitioners without the required training or in circumstances with insufficient resources.

Learn more about Abortion with the help of the given link:

brainly.com/question/11476637

#SPJ4





4 0
1 year ago
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