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3 years ago

To find the number of neutrons in an atom, what would you subtract?

1 answer:

7 0

You look up the element in the periodic table. Subtract the atomic number (small number) from the mass number (big number). The answer is the number of neutrons.

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What is the index of refraction?

laiz [17]

Answer:

a. the ratio of the speed of light in a vacuum to the speed of light in the material it is passing though

Explanation:

When a light ray enters from one medium to another, it bends. This is because the speed of light decreases as it enters a medium having more optical density. The speed of light is maximum in vacuum.

The refractive index determines the optical density of a medium. It is the ratio of the speed of light in the vacuum (c) to the speed of light in the material it is passing through (v).

$\mu=\frac{c}{v}$

6 0

4 years ago

Read 2 more answers

Can someone help me? Idk why I can't understand this

olya-2409 [2.1K]

It's been a while since I've studied this, but my answers would be:

13. 5730 years. The half-life of a substance is the amount of time it takes for half of it to decay, and, according to the graph, half of the substance remained at 5730 years.

14. 10740 years. According to the graph, only 25% of the carbon remained after 10740 years.

15. 15 atoms. According to the graph, only 12.5% of the carbon remained after 16110 years. 12.5% of 120 atoms is 15 atoms.

16. 1600 atoms. According to the graph, if a sample of carbon is 10740 years old, only 25% of it remains. To find the original amount, multiply the current amount by (100% / 25%), which equals 4. So, 4. 400 atoms * 4 = 1600 atoms is the original amount.

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3 years ago

The _____ theory proposes that the moon was a passing asteroid pulled into orbit by Earth's gravity.

Debora [2.8K]

It's the capture theory.

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4 years ago

Read 2 more answers

In how many ways can the elements of [n] be permuted if 1 must precede 2 and 3 is to precede 4?

sp2606 [1]

No. of ways in the elements of n be permuted is n!/4

Number of elements = n

Number of face in which the element of n be permuted if 1 must proceed 2 and 3 is to precede 4.

n = 4

The possible permutation will

(1,2,3,4), (1,3,2,4),(1,3,4,2),(3,4,1,2),(3,1,2,4),(3,1,4,2)

There are 6 possible outcomes

For n= 5

With 1,2,3,4 we add 5 in the arrangement with above terms

The possible number of permutation

5×6 = 30

When n = 6

30×6 = 180.

So for an element

If 1 precede 2 and 3 is yo precede 4 is

= n! ×6/4!

= n!/4

No. of ways in the elements of n be permuted is n!/4

To know more about permutation:

brainly.com/question/4416319

#SPJ4

4 0

2 years ago

How does Earth's magnetic field compare

ioda

Answer:

Explanation:

7 0

3 years ago