Electromagnetic Wave | MCQs

Explanation

Very high frequency is ITU designation for the range of radio frequency electromagnetic waves from 30 to 300 megahertz, with corresponding wavelengths of ten to one meters.

Explanation

• The wavelength of a transverse wave is the distance between two adjacent crests or troughs.
• It is a fundamental property of waves.
• It is typically denoted by the symbol λ (lambda).

Explanation

Waves produced by oscillation of material particles require a medium to travel, called mechanical waves.

Examples include sound waves and water waves.

Explanation

Light varies continuously in intensity and wavelength, making it an analog signal.

Analog signals have values that change smoothly over time — just like natural light.

Explanation

Wavelength is a measure of distance between two wave crests or troughs.

The SI unit for measuring distance is the meter (m), hence it is used for wavelength.

It is typically denoted by the symbol λ (lambda).

Explanation

Electromagnetic spectrum order (longest to shortest wavelength):

Radio waves (includes TV signals) → Infrared → Visible light → X-rays.

It follows this order, starting with television (radio waves) and ending with X-rays.

Explanation

Electromagnetic waves are transverse waves, meaning the oscillations of electric and magnetic fields are perpendicular to the direction of wave propagation.

Unlike mechanical waves, they do not need a medium and can travel through a vacuum.

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

Robert Watson-Watt was a Scottish engineer and inventor who is credited with developing the first practical radar system.

He demonstrated the first radar system in 1935.

He was knighted in 1942 for his contributions to the development of radar technology.

Radar (Radio Detection and Ranging) is a system that uses radio waves to detect and locate objects, and it played a crucial role in World War II.

Explanation

Sound travels at approximately 1,100 feet per second (766 miles per hour).

Radio waves travel at the speed of light, which is approximately 186,000 miles per second.