Explanation

Monochromatic light means light consisting of only one wavelength or colour.

It is the opposite of polychromatic, which has multiple colours or wavelengths.

Explanation

• When the air above the land is heated during the daytime, its density decreases.
• This is because warm air expands and becomes less dense than cold air.

Explanation

The Superposition Theorem is applicable to linear response only.

It states that in a linear circuit with multiple sources.

The response (voltage or current) can be calculated by summing the responses due to each source independently.

Explanation

Nuclear fission is a process in which a heavy, unstable nucleus splits into two or more smaller nuclei, releasing energy and often additional particles like neutrons.

This process is the opposite of nuclear fusion, where smaller nuclei combine to form a heavier nucleus.

Explanation

Question: A powder contains 100mg of a radioactive material that emits α-particles. The half-cycle of the isotope is five days. The mass of isotope that remains after ten days will be?

Answer: The half-life of the isotope is 5 days, which means that every 5 days, half of the remaining material decays. After 10 days, there will be two half-lives:

1. First half-life (5 days): 100mg → 50mg (half of the material decays)
2. Second half-life (next 5 days): 50mg → 25mg (half of theq remaining material decays)

So, after 10 days, 25mg of the original 100mg will remain.

Explanation

The symbol Z represents the proton number.

It is also known as the atomic number, which defines the element.

The symbol A represents the mass number (protons + neutrons).

Explanation

The electrostatic force between two electrons is F Newton, and since protons have the same charge magnitude as electrons (but opposite sign).

The force between two protons at the same distance is also F Newton.

Explanation

The order of speed of sound in different mediums, from fastest to slowest, is:

• Solid (approximately 3000-6000 m/s)
• Liquid (approximately 1000-3000 m/s)
• Gas (approximately 300-400 m/s)

Explanation

These six quantities (length, mass, electric current, time, intensity of light, and amount of substance) are the fundamental base quantities in the International System of Units (SI).

They are the basic building blocks of the SI system and are used to define all other quantities.

Explanation

The current produced in a coil due to electromagnetic induction is called an induced current.

The induced current can be positive or negative depending on the direction of the change in magnetic flux and the orientation of the coil

However, the term "induced current" is used to refer to the current that flows

As a result of electromagnetic induction, regardless of its direction being positive or negative