Waves

Question 1

displacement

Answer 1

distance moved from equilibrium

Question 2

amplitude

Answer 2

maximum displacement from the equilibrium of a wave

Question 3

wavelength

Answer 3

the distance between two adjacent points on the same wave

Question 4

period

Answer 4

the time taken for one full cycle of a wave

Question 5

frequency

Answer 5

the number of full cycles in a given time

Question 6

approximate wavelengths of em waves

Answer 6

gamma
xray
UV

Question 7

features of em waves

Answer 7

travel in a vacuum
travel at c in a vacuum
oscillating in electric and magnetic fields

Question 8

practical uses of em waves

Answer 8

radiowaves broadcasting
microwaves cooking
infrared cooking thermal imaging
visible light vision photography
ultraviolet security marking
xrays medical xrays
gamma rays sterilise food

Question 9

evidence for particle model and wave model of light

Answer 9

photoelectric effect for particle

interference and diffraction for wave model

Question 10

work function

Answer 10

amount of energy required to remove an electron from an atom from the surface of a metal

Question 11

threshold frequency

Answer 11

the minimum frequency of light incident on a metal which can cause photo electric emmision