Physics - Electromagnetive waves

Question 1

Intensity of wave formula.

Answer 1

I = k / r squared
I = intensity of wave
k = constant
r = distance from source

Question 2

Does the intensity of an electromagnetic wave increase or decrease the further away from the source?

Answer 2

decrease

Question 3

Compare intensity of two sources formula.

Answer 3

I (1) / I (2) = (d (2) / d (1))2

Question 4

What portion of the electromagnetic spectrum can humans see?

Answer 4

Visible light

Question 5

What are the 8 regions of electromagnetic spectrum in order?

Answer 5

Radio waves
Micro waves
Infra red
Visible light
Ultra violet
X-rays
Gamma rays

Question 6

What type of waves are electromagnetic waves?

Answer 6

Transverse, meaning they can travel through a vacuum.

Question 7

3 uses of radio waves

Answer 7

Network tower (AM)
Radio (FM)
TV

Question 8

3 uses of infra red waves

Answer 8

TV remote
Electrical heaters
Thermal imaging

Question 9

3 uses of ultra violet waves

Answer 9

Light bulb
Killing bacteria
curing inks

Question 10

3 uses of x-ray waves

Answer 10

X-rays
Radiation therapy
Airport security

Question 11

3 uses of gamma ray waves

Answer 11

Sterilising equipment
Tracers in medicine
Radio therapy

Question 12

How does frequency and wavelength correlated to spectrum?

Answer 12

Radio waves have the lowest frequency and highest wavelength and gamma ray waves have the highest frequency and the shortest wavelength.

Question 13

Uses of electromagnetic waves in communication

Answer 13

TV remote
Wi-Fi
Bluetooth
Satellites
Mobile phones