C11 + 12

Question 1

amplitude - 1

Answer 1

maximum displacement from equilibrium / rest position (1)

Question 2

frequency - 1

Answer 2

number of oscillations/vibrations per unit time - 1

Question 3

phase difference - 1

Answer 3

how far ‘out of step’ oscillations two points on the wave - 1

Question 4

progressive wave - 2

Answer 4

a wave which transfers energy - 1

as a result of oscillations - 1

Question 5

stationary wave - 1

Answer 5

a wave which traps / stores energy - 1

Question 6

principle of superposition of waves - 2

Answer 6

when two waves meet/interfere/overlap/superpose/collide - 1

the resultant displacement is the sum of displacements - 1

Question 7

interference - 2

Answer 7

when two waves meet /superpose/ overlap (at a point)

-there is a change in overall displacement

Question 8

coherent - 1

Answer 8

constant phase difference between the waves - 1

Question 9

intensity

Answer 9

energy per unit time per unit area (perpendicular to direction of energy transfer) - 1

Question 10

Describe a plane polarised wave -2

Answer 10

• reference to a transverse wave OR to vibrations in plane normal to direction of proportion
• oscillations/vibrations in one plane only / confined to a single wave