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3 years ago

How many protons and neutrons are present in an atom of 3919k? express your answer as integers separated by a comma?

1 answer:

7 0

To determine the number of protons and neutrons, you need to understand what are the meaning of the numbers written with the atom. The number that is written above the atom represents the mass number of the atom. The mass number is the sum of the number of protons and neutrons in the atom. The one written below would represent the atomic number of the atom and this represents the number of protons in the atom. So, for this case, mass number would be 39 and the atomic number would be 19. Therefore, the number of protons would be 19 and the number of neutrons would be 39-19=20.

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Answer:

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2 years ago

A converging lens of focal length 20 cm is placed in contact with a diverging lens of focal length 30 cm. The focal length of th

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Answer:

The focal lenth (F) =+10.0cm

Explanation:

The formular for combined focal length (F) is given as;

$1/f = 1/f_{1} + 1/f_{2}$

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F1 = 20cm

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Plugging the values into the formuar above,

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3 years ago

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Flauer [41]

Answer:

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3 years ago

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