Electromagnetic Radiation

Question 1

Source and propagation of electromagnetic waves

Answer 1

Electromagnetic waves result from the acceleration of electrical charges and are characteristics by the changed electric fields that are induced perpendicular on changed magnetic fields

Question 2

What is the source of electromagnetic radiation

Answer 2

It is the acceleration of electrical charges

Question 3

What is a changed magnetic field always accompanied by

Answer 3

It is always accompanied by a changed electric field and a changed electric field is always accompanied by a changed magnetic field. We say they are regenerating fields (to create and re-produce)

Question 4

The electromagnetic spectrum

Answer 4

• Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma - rays
• radio waves usage the longest waves but least frequency (F down, E down)
• gamma rays have the shortest waves but most frequency (F up, E up)
• F is directly proportional to E

Question 5

Visible light

Answer 5

ROYGBIV

- red, orange, yellow, green, blue, indigo, violet

Question 6

Properties of electromagnetic waves

Answer 6

• moves at the same speed as light (3 x 10^8)
• can move through a vacuum
• are transverse waves wherein the electric and magnetic field are perpendicular to each other and to the direction of movement and are caused when electric charges accelerate
• transfers energy from one place to another
• all obey the wave equation, c =fh
• can also move through a medium