Explanation

Generous means سخی

Selfish means خود غرضی

Stingy means کنجوس

Greedy means لالچی

Explanation

Refraction is the bending of light as it passes from one medium to another (e.g., air to water).

This occurs due to a change in the speed of light in different media.

Explanation

The SI unit of radioactivity is becquerel (Bq).

Curie is a non-SI unit, with 1 curie equal to 37 billion Bq.

Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration)

It is the process by which an unstable atomic nucleus loses energy by radiation.

Three of the most common types of decay are:

• Alpha
• Beta
• Gamma decay

Explanation

In simple harmonic motion (S.H.M), the restoring force is minimum at Mean position. 

The restoring force is directly proportional to the displacement from the mean position.

At the mean position, the displacement is zero, meaning the restoring force is also zero at that point. 

Explanation

Explanation

The medulla or the midbrain is responsible for important bodily functions such as heartbeat and breathing,

It is also responsible for hand-eye coordination and depth perception.

Explanation

Potassium (K, atomic number 19) has 19 electrons.

Its configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹, which is [Ar] 4s¹ in shorthand.

Explanation

The diameter of an atom is in the order of 0.2 nanometers (nm), or 200 picometers (pm), which is equivalent to 2 x 10^-10 meters.

Explanation

Small intestine is the primary site for nutrient absorption into the bloodstream.

It contains villi and microvilli, which increase the surface area for efficient absorption of digested food.

Explanation

The direction of energy flow in an ecosystem is unidirectional, moving through various trophic levels successively.

It begins with the input of solar energy, which is captured by primary producers, such as plants, through photosynthesis.