The Sun is a star around which our planet Earth and other planets and satellites of our solar system revolve along specific orbits. Sun appears to be spherical in shape and consists of glowing hot gases. It contains mostly hydrogen and helium gases. The temperature of the gas mixture is extremely high.
Therefore, the Sun mostly composed of hydrogen and helium gases.
(Answer) B. Composition mostly hydrogen and helium gas, Mass 1.989 x 10^30 Kg
Answer:
Frequency change by a factor of 2.
(b) is correct option.
Explanation:
Given that,
Mass = 16 kg
Replaced mass = 4 kg
We need to calculate the frequency
Using formula of frequency
Put the value into the formula
....(I)
...(II)
Hence, Frequency change by a factor of 2.
<span>D. People need to have the ability to protect themselves and their homes.</span>
Explanation:
In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.
Hence, in solid substances the molecules have low kinetic energy.
Whereas in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy.
In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.
Hence, gases are able to expand more rapidly as compared to liquids.
Therefore, we can conclude that in gaseous phase the space between particles tend to increase.
