Explanation

Sound travels faster in iron than in air.

This is because sound waves move more quickly through denser materials.

Like iron, compared to less dense ones, like air.

Explanation

Radio waves are used for sending sound waves over large distances.

They are capable of transmitting signals over long ranges.

This making them ideal for communication systems like radio and television.

Explanation

Radar is a radiolocation system that uses radio waves

to determine the distance , angle , and radial velocity of objects relative to the site.

It is used to detect and track aircraft, ships, spacecraft, guided missiles, motor vehicles, map

weather formations, and terrain.

Explanation

One thousand watts of power is called 1.0 kilowatt.

This is because "kilo" denotes a factor of 1,000.

So 1,000 watts equals 1 kilowatt.

Explanation

• The electricity from a cell (such as a battery) is Direct Current (DC).
• It is the flow of electric charge in one direction only, without changing direction.
• This is the type of current used in electronic devices such as smartphones, laptops, and televisions.

Explanation

Alpha rays, or alpha particles, are the least penetrating form of radiation.

They consist of two protons and two neutrons.

Making them relatively large and heavy compared to beta and gamma rays.

Explanation

The moon's surface is covered with a layer of fine dust called regolith.

This layer consists of tiny fragments of rock and mineral particles created by meteorite impacts.

Explanation

One degree of latitude is approximately 111 km everywhere, but it varies slightly: about 110.6 km at the equator and 111.7 km at the poles.

Lines of longitude, or meridians, run north-south.

Explanation

The sun reaches its maximum angular distance from the equator at the "Solstice."

During the solstice, which occurs twice a year, the sun is at its highest or lowest point in the sky relative to the equator.

Explanation

A resistor is a key component used in DC circuits to control the flow of current

While capacitors and inductors are also used in DC circuits,

Resistors are the most fundamental part of managing current.

Transformers, on the other hand, are typically used in AC circuits, not DC circuits.