electromagnetic radiation

Question 1

radiation

Answer 1

transmission of energy in the form of wave or particles through space or a material medium

Question 2

electromagnetic radiation eg

Answer 2

radio waves, microwaves

Question 3

particle radiation eg

Answer 3

alpha, beta and neutron radiation

Question 4

acoustic radiation eg

Answer 4

ultrasound, sound and seismic waves

Question 5

gravitational radiation eg

Answer 5

takes the from of gravitational waves or ripples in the curvature of spacetime.

Question 6

properties of EM radiation

Answer 6

• energy carried by waves appears in several forms : heat, sound, light, x-rays
• all waves are carried by some form of oscillation eg EM by electric and magnetic fields

Question 7

oscillation

Answer 7

repetitive varieties of some about a central value

Question 8

what term is used to describe mechanical oscillation?

Answer 8

vibration

Question 9

two types of waves

Answer 9

longitudinal + transverse

Question 10

longitudinal

Answer 10

• requires a medium through which to travel, particles of the transmitting medium are displaced along the direction of propagation

Question 11

transverse

Answer 11

don’t always require a medium to travel, energy is travelling at right angles to the direction of the oscillation

Question 12

amplitude

Answer 12

largest displacement encountered during the oscillation

Question 13

wavelength

Answer 13

distance between two consecutive points

Question 14

period

Answer 14

an oscillation is the the time taken to complete one cycle

Question 15

frequency

Answer 15

number of cycles completed every second

Question 16

rectilinear propagation

Answer 16

EM waves travel in straight lines

Question 17

radiation intensity

Answer 17

quantity of radiation energy passing through a unit area per unit of time

Question 18

wave particle duality

Answer 18

EM radiation behaves like waves, however if compromised behaves in discrete packets of energy called quanta which are pure energy.

Question 19

electric current

Answer 19

net charge flowing through any point of wire per unit time

Question 20

potential difference

Answer 20

the work done per unit charge passing between the points