Mechanical Prop...

The maximum intensity of fringes in Young's experiment is l. If one of the slits is closed , then intensity at that place becomes $${ I }_{ 0 }$$. then relation between I and $${ I }_{ 0 }$$ is

A metal wire having Poisson's ratio $$\frac {  1}{ 4 }$$ Young's modulud $$8\times {10  }^{  10} N/m^2$$ is stretched force, which produces a lateral strain of 0.02 it. The elastic potential energy stored per volume in wire is$$[in J/m^3]$$

When the load on a wire is increased from $$3 \mathrm { kg }-wt$$ to $$8\mathrm { kg } -wt$$, the elongation increases from $$0.61 \mathrm { mm }$$to $$1.02 \mathrm { mm } $$ . The required work done during the extension of the wire, is

A copper wire and a steel wire of the same diameter and length 1 m and 2 m respectively are connected end and a force is applied which stretches their combined length by 1 cm. How much each wire is elongated respectively. Y of copper = $$1.2\times { 10 }^{ 10 }$$ $$M{ m }^{ -2 }$$ and Y of steel +$$2.0\times { 10 }^{ 10 }\quad N{ m }^{ -2 }$$

Find the intensity on the screen at $$O$$ if only $$S_{3}$$ is covered 

A 2.0 m long steel cable has cross-sectional area of $$ 0.30 cm^2 $$. A 550 kg load is now hung from the cable. Assume that the cable behaves like a solid rod with an uniform cross-sectional area. Then the stress of the cable is:

Two wires of length $$l$$, radius $$r$$ and length $$2l$$, radius $$2r$$ having same Young's modulus $$Y$$ are hung with weight $$mg$$. Net elongation is

The time after which the block reaches the position where is laming maximum elongation is

All three sliits are now uncovered  and a transparent plate of thickness $$1.4\ \mu$$ and refreactive index $$1.25$$ is placecd  in front of $$S_{2}$$. Rresultant intensity at point $$O$$ is

Find the intensity on the screen at $$O$$ if $$S_{1}$$ and $$S_{3}$$ are covered.