Questions

Sound is a mechanical vibration and needs a medium for propagation. The higher the density of the medium, the faster the sound travels. So, sound cannot travel through vacuum.

As the sound travels faster in solids than liquids and gases, sound travels faster in the glass than Air and water.

The Aufbau Principle states that in the ground state of an atom, an electron enters the orbital with lowest energy first and subsequent electrons are fed in the order of increasing energies.

In token Ring , hub is called Multistation Access Unit(MAU).

Nutrients are the substances in food that provide the raw materials and energy the body needs to carry out all its essential processes.

There are six groups of nutrients:

1. Carbohydrates.

2. Fats.

3. Proteins.

4. Vitamins.

5. Minerals.

6. Water.

This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.