Revision Notes: Electromagnetic Waves & Optics

# Electromagnetic Waves Class 12 Notes Physics Chapter 8

## Physics Class 12

105 videos|425 docs|114 tests

## FAQs on Electromagnetic Waves Class 12 Notes Physics Chapter 8

 1. What are electromagnetic waves?
Ans. Electromagnetic waves are a form of energy that consists of oscillating electric and magnetic fields. They can travel through a vacuum or a medium and are generated by the acceleration of charged particles.
 2. How do electromagnetic waves propagate?
Ans. Electromagnetic waves propagate through a process called electromagnetic radiation. This occurs when an oscillating electric field creates an oscillating magnetic field, which in turn creates an oscillating electric field, and so on. This cycle allows the waves to propagate through space.
 3. What is the relationship between the wavelength and frequency of an electromagnetic wave?
Ans. The wavelength and frequency of an electromagnetic wave are inversely proportional. This means that as the wavelength increases, the frequency decreases, and vice versa. This relationship is described by the equation c = λν, where c is the speed of light, λ is the wavelength, and ν is the frequency.
 4. How do electromagnetic waves differ from other types of waves?
Ans. Electromagnetic waves differ from other types of waves, such as mechanical waves, because they do not require a medium to propagate. Mechanical waves, on the other hand, require a medium, such as air or water, to travel through. Electromagnetic waves can also travel at the speed of light, whereas mechanical waves have much slower speeds.
 5. What is the role of optics in the study of electromagnetic waves?
Ans. Optics is the branch of physics that deals with the behavior and properties of light, which is a type of electromagnetic wave. Optics involves the study of how light interacts with various materials, such as lenses and mirrors, and how it can be manipulated and controlled. Understanding optics is crucial for many applications, including the design of lenses, cameras, and optical instruments.

## Physics Class 12

105 videos|425 docs|114 tests

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