Electromagnetic Spectrum

Question 0

What is the constant speed in a vacuum

Answer 0

3 x 10^8 m/s

Question 1

Give some examples of electromag radiation

Answer 1

Light microwaves X-ray TV signals

Question 2

What is the colours in he spectrum

Answer 2

Red 
Orange 
Yellow
Green 
Blue
Violet 
Indigo

Question 3

What wavelength in meters is visible like in

Answer 3

10^-7

700nm

Question 4

What is the direction of increasing energy in the spectrum

Answer 4

IR —> visible —> UV

Question 5

What is the wavelength

Answer 5

Distance between two adjacent crests or troughs of a wave
Measured in metres or nanometers (1 x 10^-9m)
Also known as lambda

Question 6

What is frequency

Answer 6

The number of waves that pass through a fixed point in one second
Measured as 1/time and has the units per second
Commonly seen measured in hertz
Also known as NU

Question 7

What is the relationship between velocity wavelength and frequency

Answer 7

C = (lambda)(NU)

Question 8

Electromag rad with short wavelength and a high frequency

Answer 8

Gamma rays (past UV) high energy end of the spectrum

Question 9

Electromag rad with a long wavelength and low frequency

Answer 9

Radio waves below IR

Are at the low end of the spectrum

Question 10

Electro mag is considered as having a dual nature. Why

Answer 10

It is based on the wave motion and movement of particles (stream of particles called PHOTONS) with wave properties such as wavelength and frequency

Question 11

The energy carried by a photon is represented by

Answer 11

E=hv
6.63 x 10^-34 joules/second
But have to divide by a 1000 to get kilo joules