# What are electromagnetic waves class 12 physics?

Electromagnetic waves are those waves in which electric and magnetic field vectors changes sinusoidally and are perpendicular to each other as well as at right angles to the direction of propagation of wave.

## What is electromagnetic waves Class 12 notes?

Electromagnetic (EM) waves are the waves which are in relation to both electricity and magnetism. These waves are basically coupled time varying electric and magnetic fields which propagate in space. As these are waves associated with electricity and magnetism, they definitely would propagate in space.

## What are the properties of electromagnetic waves class 12th physics?

• Electromagnetic waves are transverse in nature and the electric and magnetic fields are proportional to each other.
• Electromagnetic waves do not need a medium to propagate.
• Electromagnetic waves travel at a speed of 3 × 108 m/s in a vacuum.

## What are the uses of electromagnetic waves Class 12?

• Microwaves – satellite communications and cooking food.
• Infrared – Electrical heaters, cooking food and infrared cameras.
• Visible light – Fibre optic communications.
• Ultraviolet – Energy efficient lamps, sun tanning.
• X-rays – Medical imaging and treatments.

## What is the formula for electromagnetic waves?

If the frequency of oscillation of the charged particle is f, then it produces an electromagnetic wave with frequency f. The wavelength λ of this wave is given by λ = c/f. Electromagnetic waves transfer energy through space.

## What is electromagnetic waves and its types?

The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays and gamma-rays.

## What is called electromagnetic?

Definition: Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. In other words, EM waves are composed of oscillating magnetic and electric fields.

## What are 10 electromagnetic waves?

EM radiation is classified into types according to the frequency of the wave: these types include, in order of increasing frequency, radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.

## What is electromagnetic short answer?

: a core of magnetic material (such as iron) surrounded by a coil of wire through which an electric current is passed to magnetize the core.

## What are the 7 types of waves of electromagnetic?

In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

## What are the 4 main wave properties?

No matter whether you are talking about vibrations or waves, all of them can be characterized by the following four characteristics: amplitude, wavelength, frequency, and speed.

## What are the 7 properties of a wave?

There are many properties that scientists use to describe waves. They include amplitude, frequency, period, wavelength, speed, and phase. Each of these properties is described in more detail below.

## What are the 7 types of light?

The electromagnetic spectrum includes the different forms of light waves arranged in terms of varying wavelength and frequency. These are radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

## What is frequency of a wave?

Frequency is defined as the number of oscillations of a wave per unit time being, measured in hertz(Hz). The frequency is directly proportional to the pitch.

## What are 5 uses of an electromagnet?

• Generators, motors, and transformers.
• Electric buzzers and bells.
• Relays and valves.
• Data storage devices like VCRs, tape recorders, hard discs, etc.
• Induction cooker.
• Magnetic locks.
• MRI machines.

## What is the SI unit of magnetic field?

Magnetic field is denoted by B and H. The SI unit of H is amperes per metre and the SI unit of B is Newtons per metre per ampere or Teslas.

## What is the shortest wavelength?

Gamma rays have the shortest wavelength and the highest energy among the other waves in the electromagnetic spectrum. The wavelength of the gamma rays is less than 0.01 nanometers. Most of the gamma rays from space are blocked by the Earth’s atmosphere.

## What are the basic laws of electromagnetic?

The operation of electric motors is governed by various laws of electricity and magnetism, including Faraday’s law of induction, Ampère’s circuital law, Lenz’ law, and the Lorentz force.

## What are 3 uses for electromagnetic waves?

Electromagnetic waves have a vast range of practical everyday applications that includes such diverse uses as communication by cell phone and radio broadcasting, WiFi, cooking, vision, medical imaging, and treating cancer.

## What are the two types of waves?

Waves come in two kinds, longitudinal and transverse. Transverse waves are like those on water, with the surface going up and down, and longitudinal waves are like of those of sound, consisting of alternating compressions and rarefactions in a medium.

## What are properties of EM waves?

• transfer energy from one place to another;
• can be reflected;
• can be refracted .

## What is the other name of electromagnetic?

In this page you can discover 13 synonyms, antonyms, idiomatic expressions, and related words for electromagnetic, like: , emf, electrostatic, far field, near-field, vibration, electrostatics, electromagnetic radiation, magnetic, radiation and excitation.

## Why electromagnetic is important?

Nonetheless, electromagnetic waves are vital to how we sense and experience the world. From radio and cell phones to microwaves, X-rays, and beyond, there are countless ways we take advantage of all the electromagnetic energy the universe has to offer.

## What are 3 electromagnetic devices?

• Motors and generators.
• Transformers.
• Relays.
• Electric bells and buzzers.