• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

To find the separation of a pair of double slits using youngs experiment.

Extracts from this document...

Introduction

BACKGROUND INFORMATION:

Youngs experiment involved sunlight being allowed to pass through a pinhole, S and then at a considerable distance away , through pinholes S1 and S2. The two sets of spherical waves emerging from the two holes interfered with each otherinsuch a way as to form a symmetrical pattern of varying intensity on the screen AC. This experiment is shown below

 The mathematical formula that was derived from this experiment is Λ = (a * y)/D, which can be re- arranged so that the seperation of the two slits is the subject of the equation,

 a = (λ * D)/y

EQUIPMENT:

  • Monochromatic light (red laser)
  • Measuring tape
  • Double slit
  • Piece of paper
  • Pen

PROCEDURE:

...read more.

Middle

Substitute D, y, and λ = 660nm into the formula, a = (λ * D)/y to obtain a value for the seperation of the double slits, a.

APPLICATION OF ERRORS:

  • The measurement of D will not be completely accurate, due to human inaccuracy, but this will have minimal effect on the eventual out come.
  • The wavelength of the light could possible be inaccurate, this is unavoidable
  • The tracing of the projected dots could be inaccurate due to human error, this could affect the results remarkedly.
...read more.

Conclusion

The values that were obtained for ‘a’ were only a smal percentage off the actual value of ‘a’, which was 5 *10-3m Below is a table that shows the inaccuracy of the two results.

Wavelength, λ

Distance, m

Actual distance

% Inaccuracy

660

4.998-3

5.0-3m

.04%

680

5.15-3m

5.0-3m

3%

From thes results you can deduce that the wavelength of the light is more likely to be closer to 660nm than 680nm, assuming that the results are accurate.

CONCLUSION:

This experiment has been very accurate in finding the seperation of a pair of double slits, using young’s experiment. It was also very usful in providing an insight into the concept of light travelling in waves.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Waves & Cosmology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Waves & Cosmology essays

  1. Peer reviewed

    Black Holes Research and Report

    4 star(s)

    This proves that black holes can be destroyed, and means that the black hole, if left 'starved' of matter would be depleted of energy. Einstein's equation, E=mc2, shows that energy is equal to mass, meaning the black hole will simply waste away and die in a catastrophic explosion.

  2. In this experiment I aim to find a value for the Young's Modulus of ...

    Gather results into a table so they can be easily compared. 7. From the readings, plot a graph of force x extension. 8. Find the gradient of the graph and use it to find the Young's Modulus for the tape, by using the below formula: - Young's Modulus =

  1. The aim of my coursework is to calculate the wavelength of red laser light ...

    = tan �� Distance between central maximum and 1st order spectrum Distance between grating and wall To use the diffraction grating formula we need to find the spacing between each gap in the grating. d = d x sin ? = x ? Then we use the diffraction grating formula.

  2. Hooke's Law / Young's Modulus - trying to find out what factors effect the ...

    slightly this could be as the spring was nearing its limit of proportionality. This shows that my results for this test support Hookes Law well, which proves my prediction to be correct. The preliminary test, which I had carried out also, helped in this area as if the elastic limit

  1. Refractive index by tracing light rays

    5. The glass block was removed and the marks were joined to meet CD at Q. The ray PQ in glass was completed and the normal at P was drawn as a dotted line. 6. The angle between PQ and this normal was measured and this is the critical angle (c)

  2. What factors affect the period of a Baby Bouncer?

    The averages will be put together in order to discover a reliable period of oscillation for each mass used. Human error will be aimed to be kept as minimal as it can be, by being as accurate and consistent as possible in experimental technique.

  1. An Experiment To Examine the Effect of Springs In Parallel

    I have found from a dictionary/encyclopaedia that a springy material gets its elasticity from the balance of attracting and repelling forces, which hold together the molecules. When a spring is at rest (not squeezed or stretched) the attracting and repelling forces between the molecules are exactly balanced.

  2. Waves and Cosmology - AQA GCE Physics Revision Notes

    The Sun?s spectrum has the same general shape as the black body curve. The dips are the wavelengths that are absorbed by the gas that surrounds the Sun. * Without a bright light source, the emission spectrum from a sodium flame consists of a yellow line (wavelength of 590 nm)

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work