Explanation

All electromagnetic waves travel at the same speed through empty space

Electromagnetic waves are formed between electrical and magnetic fields due to vibrations.

Electromagnetic waves travel with the speed of light in free space.

The speed of light is  3*10^8 m/s

Hence, Electromagnetic waves travel at the speed of 3*10^8 m/s.

Explanation

At the top of the waterfall, energy is stored in the form of gravitational potential energy

but when it falls, it gets converted from potential to kinetic energy

Potential energy due to the object's height above the Earth is converted to kinetic energy as it falls

Explanation

“Tooth Decay” due to the deficiency of Fluorine.

Tooth decay occurs when foods containing carbohydrates sugars and starches are left on the teeth.

Explanation

Explanation

The least count of a Vernier caliper is 0.01mm.

It is the smallest measurement that can be accurately read using the instrument.

It is derived from the difference between one main scale reading and one Vernier scale reading.

Explanation

Number of moons in the planets:

Mercury: 0

Venus: 0

Earth: 1

Mars: 2

Jupiter: 95

Saturn: 146

Uranus: 27

Neptune: 14

Explanation

The moon is a satellite because it moves around Earth.

Earth and the moon are called "natural" satellites.

ND5-07-2023

Explanation

 Short-sight defect could be corrected by using concave lens while long-sight defect could be corrected by using convex lens.

Explanation

When fossil fuels are burned,

they release large amounts of carbon dioxide,

a greenhouse gas, into the air

.ND18-5-2023

Explanation

The carbon dioxide (CO₂) molecule has a linear structure, with a bond angle of 180°.

Due to the two double bonds between carbon and oxygen atoms.