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adelina 88 [10]
3 years ago
15

In a controlled experiment, what is manipulated by the researcher?

Biology
1 answer:
vladimir1956 [14]3 years ago
4 0

Answer:

independent variable .. i think

Explanation:

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An owl has good night vision because its eyes can detect a light intensity as small as 5.0 × 10-13 W/m2. What is the minimum num
Lady bird [3.3K]

Answer:

Thus, the minimum number of photons per second is 77.34

Explanation:

Light intensity, I_{min} =  5\times 10^{-13} W/m^{2}

Pupil has a diameter, d = 8.5 mm

                                      = 8.5 x 10^{-3} m

Radius of the eye, r = 4.25 x 10^{-3} m

∴ Area of the eye, A = \pi .r^{2}

                                 = 3.14\times \left ( 4.25\times 10^{-3} \right )^{2}

                                = 5.6\times 10^{-5} m^{2}

Let P_{min} be the minimum number of photons.

Therefore, P_{min} = I_{min} x A

                                              = 5\times 10^{-13} x 5.6\times 10^{-5}

                                             = 2.8\times 10^{-17} W

Thus the minimum number of photons is given by

N_{min}=P_{min}/E

where E = hc/\lambda

             = \left (6.63\times 10^{-34}\times 3\times 10^{8}  \right )/548\times 10^{-9}

            = 3.62\times 10^{-19} J

Therefore, N_{min} = \frac{2.8\times 10^{-17}}{3.62\times 10^{-19}}

                                              = 77.34 photons per second

Thus, the minimum number of photons per second is 77.34

4 0
3 years ago
Scientists can tell the average temperature of the earth by studying an ice core.<br> True<br> False
OLEGan [10]

Answer: True

Explanation:

5 0
3 years ago
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Why is a lagging strand not needed during protein synthesis?
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Answer:

template 5'->3"

Explanation:

As we all know, with a linear chromosome, on the lagging strand (template 5'->3') of DNA replication, when the last piece of RNA primer at the 3' end is removed, the DNA cannot be extended and this creates the end replication problem.

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3 years ago
What prediction can you make about why oil and water interact?
Dmitry_Shevchenko [17]
They will not mix because the oil does not have a chemical charge large enough to break the hydrogen bonds between the water molecules.  
3 0
3 years ago
The relatively long half-life of lipid soluble hormones (steroid hormones) compared to water soluble hormones is due in part to
Arturiano [62]

Answer:

The transport protein-hormone complexes of lipid soluble proteins can not cross the filtration membrane of glomerulus.

Explanation:

Steroid hormones are water-insoluble (hydrophobic) in nature. Since blood has watery medium, the plasma, the lipid-soluble hormones travel in blood through transport proteins. The transport protein-hormone complexes are too large to cross the filtration membrane of glomerulus. The impermeability of the filtration membrane of glomerulus for protein-hormone complexes increases the half-life of lipid-soluble proteins.

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3 years ago
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