## Interference and diffraction

### 1

Which of the following wave properties can change during diffraction?

### 2

What term is used to describe two waves when the crests and troughs of match as below?

### 3

Two waves are coherent, what characteristics do they share?

### 4

A coherent source produces two waves X and Y - which of the following path lengths of waves would produce constructive interference if the waves were to meet at a point?

### 5

A coherent source produces two waves X and Y - which of the following path lengths of waves would produce destructive interference if the waves were to meet at a point?

### 6

Green light is passed through a diffraction grating with 5000 lines per mm and bright fringes are observed on a screen 2 m away.

Which of the following would increase the fringe spacing on the screen?

### 7

Microwave radiation of wavelength 40 mm passes through two slits P and Q on a metal sheet.

A microwave detector S detects points of maximum and minimum intensity in the region beyond the metal plate.

Which value of path difference PS - QS will produce constructive interference?

### 8

Microwave radiation of wavelength 40 mm passes through two slits P and Q on a metal sheet.

A microwave detector S detects points of maximum and minimum intensity in the region beyond the metal plate.

Which value of path difference PS - QS will produce destructive interference?

### 9

Monochromatic light of wavelength 589 nm is incident on a grating - the spacing between lines on the grating is 4.8x10-6 m.

What is the angle between the zero order and first order maxima?

### 10

Monochromatic light of wavelength 589 nm is incident on a grating - the spacing between lines on the grating is 4.8x10-6 m.

What is the angle between the first order and second order maxima?