Explanation

Explanation

Explanation

Damping is the process in which oscillation amplitude decreases due to energy loss (like friction or resistance).

It gradually reduces the motion of the system.

Explanation

Viscosity is the internal friction that resists the relative motion of fluid layers.

It measures how “thick” or resistant to flow a fluid is.

Explanation

In a vacuum, sound cannot travel at all (velocity = 0 m/s) because it needs a medium.

Electromagnetic waves (infrared, microwave, ultraviolet) all travel at the speed of light in vacuum.

Explanation

Aristotle (384–322 BC) wrote Physica, considered the first systematic book on physics.

It dealt with motion, elements, and natural laws, laying the foundation of classical science.

Explanation

Rule 1: Non-zero digits are always significant.

In the number 1.035, the digits 1, 3, and 5 are all non-zero and therefore significant.

Rule 2: Zeros between non-zero digits are significant.

The zero between the 1 and the 3 is a captive zero, which means it is significant.

This gives a total of four significant figures (1, 0, 3, 5). 

Explanation

Seaweeds, especially brown algae, accumulate iodine from seawater.

They are the primary natural source of iodine used in medicine and industry.

Explanation

Potassium is a highly reactive alkali metal and reacts violently with water and air.

Storing it under kerosene prevents contact with moisture and oxygen, keeping it safe.

Explanation

Heavy water, also known as Deuterium Oxide (D₂O).

It is used as a neutron moderator in nuclear reactors.

Due to its ability to slow down neutrons without absorbing them