# O level Electromagnetic waves quiz one

#### Quiz Description

Here in this physics quiz, we shall study electromagnetic waves. Our main focus will be on the electromagnetic spectrum and its characteristics. It’s been seen that the arrangement is done with respect to frequency and wavelength. There are a lot of other concepts on the electromagnetic spectrum covered in this quiz.

Electromagnetic waves, often referred to as EM waves are waves that result from vibrations between an electric field and a magnetic field. They are formed when an electric field comes in contact with a magnetic field, and these two fields are always perpendicular to each other. EM waves travel at the speed of light (3.00x10^8 m/s) in a vacuum and are neither deflected by an electric field nor a magnetic field. However, they can be diffracted. They don't need any medium for their transmission because they can travel through anything be it a solid material, air, or in a vacuum. One important fact about EM waves is that they are transverse waves, meaning their measurements are done by their amplitudes and wavelengths.

EM waves sound interesting, right? Take this quiz in order to discover a lot more about this section of physics. Good luck as you answer the quiz.

Among the four, the highest wavelength is of?

Correct
• Infrared
• Gamma rays
• Ultraviolet

What charge carries electromagnetic waves?

Correct
• positive charge
• negtive charge
• no charge
• both positive and negative charge

Electromagnetic wave with the lowest frequency?

Correct
• Gamma rays
• Infrared
• Ultraviolet

In the electromagnetic spectrum, a wavelength of 10(-B) m correspond to

Correct
• X-rays
• Ultraviolet
• Infrared
• Gamma rays

Medium of transport of electromagnetic waves?

Correct
• In vacuum
• with medium
• both in vacuum and with medium
• none

Electromagnetic spectrum comprises of?.

Correct
• tranverse waves
• longitudinal waves
• both longitudinal and tranverse waves
• latitudinal waves

Waves that cannot be seen under the electromagnetic spectrum?

Correct
• Micro waves
• Infrared
• Ultraviolet

When the medium of electromagnetic waves chenges from air to water, their speed

Correct
• increase
• decrease
• remain thesame
• none of the above

Electromagnetic waves obeys the law of?.

Correct
• refraction
• reflection
• both reflection and refraction
• momentum

Speed of electromagnetic waves in vacuum is ?.

Correct
• 30 * 10(8) ms-1
• 4 * 10(8) ms-1
• 3.0 * 10(8) ms-1
• 6 * 10(8) ms-1

As the speed decreases if we change the medium of electromagnetic waves from less dense to more dense medium, the frequency?.

Correct
• also decreases
• also increases
• remain same
• may increase of decrease

Electromagnetic waves?

Correct
• transfers energy
• cannot transfer energy
• may transfer energy
• are longitudinal

Sound waves is lowest in ?.

Correct
• Air
• Water
• Solid
• Vacuum

A sound wave travel through air at a speed of 330m/s.  if the frequency  of the wave is 20Hz, the wavelength is?

Correct
• 0.06m
• 16.5m
• 6.600m
• 33M

The wave property that makes it possible for sound to be heard round a bend is ?.

Correct
• diffration
• reflection
• interference
• refraction