General instruction same as in chapter 1.
Assertion: No interference pattern is detected when two coherent sources are infinitely close to each other.
Reason:The Fringe width is inversly proportional to the distance between the two slits and a singel fringe may occupy the whole screen.

No interference pattern is detected when two coherent sources are infinitely close to each other. Why?

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:No interfernce pattern is observed,when two coherent source are infinetely close to each other. Reason:The fringe width is inversely proportional to the istance betwen the two slits.

General instruction same as in chapter 1. Assertion:In two half life of a radioactive sample, all nuclei will decay. Reason:Half life T=(dN)/(dt) .

General instruction same as in chapter 1. Assertion: The electrostatic force between the plates of a charged isolated capacitro increases, when a dielectric fills whole space between the plates. Reason:The electric field between the plates of a charged isolated capacitor increases, when a dielectric fills the whole space between the plates.

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:In Young's double slit experiment,the two slits are at distnace d apart.Interference pattern is obsreved on the screen .When it is directly opposite to one of the slits a dark fringe is observed.Then,the wavelength of the wave is proportional to the square of th distnce fo the slits. Reason:For a dark fringe,the i ntensity is zero.

Given instructions same as in chapter 1. Assertion:In Hertz experiment, the electric vector of radiation produced by a source gap is parallel to the gap. Reason:Production of sparks between the detector gap is maximum when it is perpendicular to the source gap.

In a double slit experiment the distance between the slits is 3 mm and the slits are 2 m away from the screen. Two interference patterns can be seen on the screen one due to light with wavelength 480 nm, and the other due to light with wavelength 600 nm. what is the separation on the screen between the fifth order bright frings of the two interference patterns?