Explanation

Couple is not a part of a microscope; it's unrelated terminology in this context.

Stage, Course Adjustment, and Mirror are essential components of a microscope used for holding slides, focusing, and reflecting light, respectively.

Explanation

Mass number = Protons + Neutrons in an atom.

Carbon's most common isotope (Carbon-12) has 6 protons and 6 neutrons, making its mass number 12.

Explanation

Fission is the process of splitting an atomic nucleus into smaller nuclei, releasing a large amount of energy.

It is used in nuclear power plants and atomic bombs.

Explanation

Explanation

On November 3, 1957, the Soviet Union sent a dog named Laika into space aboard Sputnik 2.

Laika became the first living being to orbit the Earth, though tragically, she did not survive the mission.

Explanation

Cotyledons provide food to the embryo during seed germination.

It also protect the baby plant by being a part of the seed structure that safeguards the developing plant.

Cotyledons are the first leaves of a seedling.

It play a crucial role in the early stages of growth.

Explanation

Starfish belong to the phylum Echinodermata, which includes marine animals with radial symmetry and a water vascular system.

They have a tough, spiny skin and can regenerate lost arms, making them unique among marine organisms.

Explanation

Self-Contained Breathing Apparatus (SCBA) provides firefighters with a portable air supply.

It uses lightweight materials to ensure ease of movement and safety in hazardous environments.

Explanation

Magnesium Sulphate is also known as Epsom salt.

It is an inorganic salt.

Its formula is MgSO4(H2O)x.

The formula of Epsom salt is MgSO₄·7H₂O (heptahydrate sulphate mineral epsomite).

Magnesium Sulphate is used in the field of agriculture.

Epsom Salt is used as a component of bath salts, beauty products, to improve crops and removal of splinters.

Explanation

Frequency is calculated using the formula:

f = v / λ

where v = 8 m/s (speed), λ = 2.5 m (wavelength)

So, f = 8 / 2.5 = 3.2 Hz