Diffraction (AQA A Level Physics)

A diffraction grating with 1000 lines per cm has light passed through it. An identical light source is also passed through two slits 0.5 mm apart.

Both will produce intensity maxima and minima on a screen.

Which of the following statements about the separation and sharpness of the maxima is correct?

Monochromatic light with a wavelength of 600 nm is observed through a diffraction grating with 500 lines per mm.

The light is passed through a narrow slit where the lines from the slit are parallel to the grating. The light goes through the slit then the grating.

The observer changes position from R (parallel with the grating), then S (opposite the slit) and finally T (parallel to the grating on the opposite side).

What is the number of images they would see in total?

Yellow light with a wavelength of 600 nm is used in a diffraction grating experiment. The grating has a separation of 2.00 μm.

What would be the angular separation between the first order and second order maxima?

Monochromatic light of wavelength 650 nm is incident normally on a plane diffraction grating having 7 × 10⁵ lines m^–1. An interference pattern is produced. What is the highest order visible in this interference pattern?

A beam of monochromatic light with a wavelength of 690 nm is directed at a diffraction grating with 300 lines per mm as shown in the diagram

This set up produces a series of maxima on the screen, what is the greatest number that can be observed?

A single slit diffraction pattern is produced on a screen using a blue laser. The intensity of the central maximum is plotted on the axes in the figure below.

The laser is replaced with a ray box and lamp that produces a narrow beam of white light.

Which of the following describes the appearance of the diffraction pattern and the intensity pattern?

The diagram below shoes a laser emitting orange light directed at a single slit, where the slit width is greater than the wavelength of the light. The intensity graph for the diffracted orange light is shown.

The laser is replaced by a laser emitting green light.

Which option shows how the intensity varies with position for the orange and green light sources on the screen?

A diffraction grating has 200 lines per mm. It is illuminated with monochromatic light of wavelength 650 nm.

What is the angle of the second order maximum?

The figure below shows a spectrometer that uses a diffraction grating to split a beam of light into its constituent wavelengths and enables the angles of the diffracted beams to be measured.

Light with a particular wavelength is passed through the diffraction grating. The angle of diffraction θ at the centre of the first observed beam at Z in the image above is 63.0⁰ and the grating has 1562 lines per mm.

A dark fringe is observed at position W, with the central maximum at the straight-through position.

How many orders of maxima of this light are present at this wavelength?

This question is about the measurement of the wavelength of laser light.

The light is shone onto a diffraction grating at normal incidence.

The light transmitted by the diffraction grating produces five spots on a screen. These spots are labelled P to T as shown in the diagram below.

A student uses a meter ruler with 1 mm divisions to take readings. She uses these readings to obtain the measurements x, y and z the distances between centres of the spots.

The table shows her measurements and her estimated uncertainties.

The distance between the centres of spots P and R and the distance between the centres of R and T are equal.

That is:

x + y = z

What is the percentage uncertainty in the sum of x and y?

Monochromatic electromagnetic radiation of wavelength 3.2 x 10^-7 m is incident normally on a diffraction grating with 5.0 x 10⁵  lines per meter.

What is the highest order maximum produced?

A discharge lamp emits light of four colours: red ( λ = 665 nm), green ( λ = 550 nm), blue ( λ = 470 nm) and violet ( λ = 400 nm). The diagram shows light from the lamp incident normally on a diffraction grating with 0.8 x 10³ slits per millimeter. The light is viewed through a telescope that can be rotated as shown.

As the telescope is rotated from the straight through position, each of the four colours is observed as a bright line at its corresponding first-order diffraction angle.

How many additional order of maxima will be seen with this set up for the colour that is observed furthest away from the central maxima?

A diffraction grating is illuminated normally with light of wavelength 5.5 x 10^-7m.

When a screen is 1.2 m from the grating, the distance between the zero and first-order maxima on the screen is 0.40 m.

What is the number of lines per mm of the diffraction grating?

Light of wavelength 650 nm is incident on a diffraction grating which has 500 lines per mm.

What is the angular separation between the two second-order maxima?

A parallel beam of monochromatic light is directed normally at a plane of transmission grating which has N slits per meter.

The second order diffracted beam is at an angle θ to the zero-order transmitted beam.

The grating is then replaced by a plane transmission grating which has 4N slits per meter.

Which one of the following statements is correct?

Light of wavelength λ is incident normally on a diffraction grating for which adjacent lines are a distance 5 λ apart. What is the angle between the third order maximum and the straight-through position?

A diffraction grating was used to measure the wavelength of a certain line of a light emission spectrum.

The grating had 500 lines per millimeter. The angle of diffraction of the third order line was 25.3⁰.

What is the energy in eV of a photon of this wavelength?

Figure 1 shows a laser beam of wavelength 550 nm incidental normally on a diffraction grating.

The LDR of a scanning photometer is moved across the diffracted beam and produces the scan shown in Figure 2.This shows the central bright fringe with one further maximum (the first order image) on each side of it. The distance from the diffraction grating to the LDR is 150 mm.

Figure 1

Figure 2

What is the correct order of magnitude for the number of lines per mm on the diffraction grating?