3 years ago

If an atom has a mass number of 23, which of the following is always true?

Physics

1 answer:

WINSTONCH [101]3 years ago

6 0

The number of protons in the nucleus does not equal the number of nuetrons

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Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears . samuel takes a sip to discover that th

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It is a Physical Change, because the water and the salt kept their original properties. I hope this helps! :) Have a great day!

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3 years ago

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Which is a derived unit? A Meter B Second C Kilogram D Newton

statuscvo [17]

The answer is Newton because it can be derived from the other units.
1 Newton = 1 kg⋅m⋅s−2

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4 years ago

Oxygen and hydrogen are kept under the same temperature and pressure. Oxygen molecule is 16 times more massive than hydrogen one

olya-2409 [2.1K]

Answer:

The average speed of molecule of oxygen is one-fourth of the speed of the hydrogen molecule.

Explanation:

The kinetic energy of gas molecule is given by following equation:

$K.E = \frac{3}{2} KT$

Since the temperature (T) is constant for both molecules. Therefore, there kinetic energies will also be the same. Therefore,

$K.E_{O_2} = K.E_{H_2}\\\frac{1}{2}m_{O_2}v_{O_2}^2 = \frac{1}{2}m_{H_2}v_{H_2}^2 \\\\but,\\\\m_{O_2} = 16m_{H_2}\\\\therefore,\\16 m_{H_2}v_{O_2}^2 = m_{H_2}v_{H_2}^2\\\\\\taking square root on both sides, we get:\\4v_{O_2} = v_{H_2}\\\\v_{O_2} = \frac{v_{H_2}}{4}$

The average speed of molecule of oxygen is one-fourth of the speed of the hydrogen molecule.

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3 years ago

How do you define radiation (whats the definition for radiation?)

stiv31 [10]

Answer:

Radiation is energy that comes from a source and travels through space and may be able to penetrate various materials. Light, radio, and microwaves are types of radiation that are called nonionizing.

Explanation:

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3 years ago

Everything that has __________________ also feels the gravitational force.

galina1969 [7]

Answer: Don't quote me I believe it's weight like mass and stuff

Explanation:

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3 years ago