Explanation

Radioactive isotopes, such as carbon-14 and uranium-238, decay at a steady rate.

It allowing scientists to measure the age of fossils and rocks.

This technique is known as radiometric dating.

Explanation

Evaporation occurs when molecules on a liquid's surface gain enough energy to escape into the air, and this can happen at any temperature, not just at boiling point.

It's a slow process at lower temperatures, but faster at higher temperatures.

Explanation

• Group IIIA (or group 13) elements, such as boron (B), aluminum (Al), and gallium (Ga), lose three electrons to form ions with a charge of +3.
• This means that they typically form compounds by losing three electrons, resulting in a valency of +3.

Explanation

• An alloy of Cu - Sn is called Bell metal.
• Bell metal is a specific type of bronze with a higher tin content, commonly used for making bells.

Explanation

• Red meat is a good source of protein and other nutrients.
• It is not a significant source of calcium.

Explanation

The potential energy (PE) of an object is calculated as:

PE = mass x gravity x height

= 1 kg x 10 m/s^2 x 1 m

= 10 Joule

So, the energy possessed by the body is 10 Joule.

Explanation

One Faraday (F) is equal to 96,500 Coulombs (C).

The Faraday is a unit of electric charge.

It represents the amount of charge required to deposit one mole of electrons (6.022 x 10^23 electrons) at an electrode.

Explanation

• Hydrogen (H2) is the lightest molecule, with a molecular weight of 2.016 g/mol.
• According to Graham's Law of Diffusion, the rate of diffusion of a gas is inversely proportional to the square root of its molecular weight.
• Therefore, hydrogen diffuses the fastest.

Explanation

• De Broglie extended the wave-particle duality to electrons in 1923.
• He proposed that particles such as electrons exhibit wave-like properties.
• A hypothesis that was later confirmed experimentally and became a fundamental concept in quantum mechanics.

Explanation

• The mismatched pair is: Proteases → Carbohydrate
• Proteases are enzymes that break down proteins, not carbohydrates.