Electromagnetic Radiation

Question 1

What are the different types of ER

Answer 1

Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays

Question 2

Properties of ER

Answer 2

Waves are carried by oscillations

Longitudinal waves
Transverse waves

Question 3

Longitudinal waves

Answer 3

Particles are displaced along direction of propagation

Question 4

Transverse waves

Answer 4

Particles are perpendicular to the direction of propagation

Question 5

Wave frequency

Answer 5

The number of waves/oscillation cycles completed every second

f = 1/T or T = 1/f

T = period
f = frequency
1 = a second

Measured in Hertz (Hz)

Question 6

Wave speed/velocity

Answer 6

c= d/t = wavelength/T

speed = frequency x wavelength

c = velocity
d = distance
t = time
T = period

Question 7

Inverse square law

Answer 7

Intensity = energy per second/area
I = 1/d2

Question 8

Radiation intensity definition

Answer 8

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

Intensity decreases as distance increases

Question 9

Electrical current definition

Answer 9

The net charge flowing through any point of wire per unit time

I = Q/t

I = current
Q = charge (number of electrons times their charge)
t = time

Question 10

What is electrical voltage

Answer 10

Pressure that pushes electrons

V = IR

V = voltage
I = current
R = resistance

Question 11

List 3 types of radioactive decay

Answer 11

Alpha decay
Beta decay
Gamma decay