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3 years ago

People with type o blood are universal donors but can only receive blood form other type o donors

Biology

1 answer:

krok68 [10]3 years ago

8 0

Answer:

O donors can donate to other type

Explanation: the reason is that O type blood can donate to type A, B, AB and O is Compatible to other type of blood - but Kidney transplants need the same type of blood.

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Which of the following tests can best help you classify a rock as sedimentary, metamorphic, or igneous?

Nataly_w [17]

Answer: I believe you need to examine the layers, the color, texture.

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3 years ago

If a goal post was separated into the four pieces that make up the base,the crossbar, and the arms, and all four pieces were lai

erma4kov [3.2K]

Answer:

68 1/2 foot length

Or 22 5/6 yards.

Explanation:

The yard length of the part of the goal post

The base (10 foot)

The crossbar (18 1/2 )

And two arms (20 foot each)

Let's sum up the total yards

=(10 + 18 1/2 + 20 +20) foot

= 68 1/2 foot length

Or 22 5/6 yards.

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2 years ago

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

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3 years ago

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