Youngs Double Slit Experiment

Young's modulus of elasticity is given by the formula:
Stress is the force per unit area, while strain is the relative deformation.
The Young's modulus of a material depends on the temperature and material properties.
When the temperature of the wire is increased, the material undergoes thermal expansion, and the atomic vibrations within the wire also change. Generally, an increase in temperature leads to a decrease in Young's modulus because the atomic bonds become weaker, reducing the material's ability to resist deformation.
Thus, as the temperature is doubled, the Young's modulus of elasticity will decrease.

The fringe width in the Young's double slit experiment is given by the formula: Where: - is the fringe width, - is the wavelength of the light, - is the distance between the screen and the slits, - is the separation between the slits.
When the apparatus is immersed in a liquid of refractive index , the wavelength of the light in the liquid becomes .
Thus, the new fringe width will be: Given:
- Initial fringe width ,
- Refractive index .
Now, calculating the new fringe width: Thus, the new fringe width is .