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3 years ago

A person withAIDS is likely to develop infectious disseases because the virus that causes AIDS

1 answer:

4 0

Hey there!

AIDS stands for acquired immune deficiency syndrome and it indeed does damage the immune system. It causes the loss of immunity which therefore decreases the body's resistance to infections.

Thus, the correct answer is B.

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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

The RNA World Hypothesis is based on the experimental finding that RNA can self-catalyze. This means that RNA can do what?

KatRina [158]

It can cause its self to start

8 0

3 years ago

Read 2 more answers

If people use an ecosystem without damaging it then what they are doing is__ ?

soldi70 [24.7K]

Answer:

Sustainable use of the environment

Explanation:

Be it the ecosystem or the food you eat, if you just take up whatever you need instead of over exploiting the resources, another life can benefit from it. The relationship we need to form with our environment should be mutualism or commensalism but not parasitism.

4 0

2 years ago

Which statement is true about gold and helium

RideAnS [48]

Answer:

needs more info to be answered could you state them down or put a pic

Explanation:

4 0

3 years ago

What is chromosomes

vovikov84 [41]

A chromosome is a Deoxyribonucleic acid molecule with part or all of the genetic material of an organism.