Using light of wavelength `6,000 overset@A`,it is found that in a thin film of air,7 fringes occur between two points,deduce the difference of the film thickness between these points.

Light of wavelength 6,000 overset @A is incident on a thin film of refractive index 1.5 ,such that angle of refraction into the film in 60^@ .Calculate the smallest thickness of the film,which will make it appear dark by reflection.

What is the distance between the two points which have a phase difference of 2pi ?

Light of wavelength 5,000 overset @A is incident on a double slit.If the overall separation of 10 fringes on a screen 200 cm away is 1.0 cm,find the distance between the two slits.

In a Young,s double split experiment, light of wavelength 4000 overset@A is incident on a double slit. If the overall separation of 10 fringes on a screen 100 cm away is 0.4 cm. Find the distance between the two slits.

Write any two points of difference between insecticides and Weedicides.

5J work is done in moving a positive charge of 0.5 C between two points. What is the potential difference between these points?

How much work is done to carry 2 c of charge between two points having potential difference of 12V?

In a Young's double slit experimnet,red ligth of wavelength 6,000 overset @A is used and the nth bright fringe is obtained at a point P n the screen .Keeping the same setting,the source is replaced by green light of 5,000 overset@A and now (n+1) th brigth fringe is obtained at the point P .Calculate the value of n.

Bring out two points of differences between Bone and Cartilage.