NCERT Class 12 Physics Chapter 8 Electromagnetic Waves Notes (Handwritten Notes & PDF Download)

Physics is a very important subject for students. It may be hard for some students. For helping students here we have shared NCERT Class 12 Physics Chapter 8 Electromagnetic Waves Handwritten Notes.

The Electromagnetic Waves notes is a best resource for students who are preparing for their board exam because it compile the entire lesson in short and include every important topic.

NCERT Class 12 Physics Chapter 8 Electromagnetic Waves Notes

Next Chapter: Ray Optics and Optical Instruments
Previous Chapter: Alternating Current

Other Subjects:
Class 12 Biology Notes
Class 12 Chemistry Notes

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Electromagnetic Waves Notes PDF

We have also shared the PDF of Electromagnetic Waves Notes so students don’t feel any difficulty in reading the notes. You can ask your doubts in the comment section. We will be happy to help you.

Key Points: Electromagnetic Waves Notes PDF

Displacement Current

It is a current which produces in the region in which the electric field and hence the electric flux changes with time.

Electromagnetic Waves :

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.

Properties of Electromagnetic waves :

• They are produced by accelerated or oscillating charge.
• They do not require any material medium for their propagation.
• The cross-product of electric field and magnetic field tells us the direction of propagation of waves
• The direction of variation of electric field and magnetic field are always perpendicular to each other.
• The speed of electromagnetic wave in medium is less than the speed of light in vaccum.
• Both fields are in same phase.

Infrared wave :

• Use in physiotherapy to treat muscular strain.
• Use in solar water heater and cookers.
• Use in weather forecasting and TV remote.
• Thermal imaging sensor.
• Infrared rays are readily absorbed by (water) molecules present in most of the substances and increase thermal motion.
• Used to send signal in fog as this wave scatters less due to its longer wavelength.

Visible light :

• To see the beautiful world.
• In movie screen, in cinema halls.
• In Laser (Light amplification by stimulated emission of radiation).

Ultraviolet Rays:

• To destroy bacteria in surgical instrument.
• In burglar alarm.
• In water purifiers.
• eye surgery.

X-Rays:

• To detect fractured bones.
• To Cure Skin disease.
• To detect explosive in body of smugglers.
• In detection of cracks of bridge.

Gamma Rays

• In treatment of cancer (radiography).
• To produce nuclear reaction.

Microwave Oven : It is a device used in kitchen for heating and cooking the food.

Features of Notes

• Students can use Electromagnetic Waves notes for last minute revision.
• In the last few days of the exam, students feel very stressed due to the pressure of the exam. Notes will be very helpful for managing the stress in the last days of the exam.
• All notes are totally free of cost and students can access notes anytime on our for totally free of cost.
• Electromagnetic Waves Notes PDF are created very carefully so you can rely on this notes.

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