chapter 12: superposition 🙄

Question 1

explain the principle of superposition

Answer 1

when two or more waves of the same type meet at a point, the resultant displacement of the waves is equal to the vector sum of their individual displacements at that point

Question 2

what are the characteristics of stationary waves

Answer 2

equal amplitude, frequency
same speed in opposite directions

Question 3

what does coherent sources mean

Answer 3

they have constant phase difference

Question 4

what are the conditions for observable interference

Answer 4

1. sources must be coherent
2. waves cannot be polarised
3. amplitude of both waves must be similar

Question 5

define diffraction

Answer 5

spreading of waves when they pass through an opening or around an obstacle