Electromagnetic Waves PDF

SCIENCE REVIEWER ELECTROMAGNETIC WAVES - A charged particle produces an electric field around itself. - When another particle or body is placed in this field, that particle or body will experience an electric force. “Analogous to the electric field is the magnetic field” - A magnetic field is a regi...

SCIENCE REVIEWER ELECTROMAGNETIC WAVES - A charged particle produces an electric field around itself. - When another particle or body is placed in this field, that particle or body will experience an electric force. “Analogous to the electric field is the magnetic field” - A magnetic field is a region of space where a magnet is capable of exerting either a repulsive or Attractive force on a magnetic material. - In addition to magnets, a moving charged particle also generates a magnetic field. - Electromagnetic waves can be created by any type of charged particles. - Charged particles always have an electric field around it. - A moving charged particle can create a magnetic field. - But an accelerating charged particle can create a propagating Electromagnetic Wave. -The electric field and the magnetic field of an electromagnetic wave are perpendicular to each other and to the direction of motion of the wave. - E stands for the electric field - B for the magnetic field - V for the velocity of the Electromagnetic wave, and - ʎ for wavelength. Electromagnetic Waves -An electromagnetic wave is produced by accelerating charged particles or particles oscillating about an equilibrium position, with the electric field and the magnetic field vibrating perpendicularly to each other and to the direction of wave propagation. - Hence, electromagnetic waves are transverse waves. Speed of Propagation formula V – Speed of Propagation f - Frequency ʎ - Wavelength v=fʎ In a vacuum, all electromagnetic waves travel at the speed of light, which is equivalent to 299,792,458 m/s or approximately 3×108 m/s. A magnetic field is capable of exerting either a attractive Or repulsive force on a magnetic material. Hence, electromagnetic waves are transverse waves. Is the symbol used to represent the “Wavelength”. Electro magnetic- This can be created by any type of charged particles. What is the unit of measurement in the speed of light? 299, 792, 458 m/s Charged particles always have an Electric Field around it. A moving charged particle can create a Magnetic Field Speed of Propagation formula. Speed of light = 3×108 m/s ELECTROMAGNETIC SPECTRUM - arranged electromagnetic waves from longest wavelength to shortest. REFLECTION OF LIGHT - Reflection is the bouncing back of light into the same medium it has been traveling after striking a surface. The Laws of Reflection 1. The angle of incidence is equal to the angle of reflection, θi = θr. 2. The incident ray, the normal, and the reflected ray all lie on one plane. Types of Reflection - Reflection from smooth surfaces is called regular reflection. - Reflection from rough surfaces is called diffuse or irregular reflection. Regular VS. Diffused Mirrors and Reflection of light Plane mirrors - these are flat mirrors that reflect images in their normal proportions, reversed from left to right. Real image – an object is formed by actual intersection of reflected rays. Virtual image – is formed behind the mirror and is upright relative to the object. A spherical mirror - has a reflecting surface taken from the surface of a sphere. Concave mirror -curves inwards in the direction of the incident rays.Concave mirrors are spherical mirrors that curve inward like a spoon. Convex mirror – bulges outward to the incident rays. Convex mirrors are also spherical mirrors. However, unlike concave mirrors, they bulge out and distort the reflected image, making it smaller.