Physics-
General
Easy
Question
Two identical narrow slits 
are illuminated by light of wavelength 
from a point source P If, as shown in the diagram above the light is then allowed to fall on a screen, and if n is a positive integer, the condition for destructive interference at Q is that
The correct answer is:
Related Questions to study
physics-
A ray of light of intensity I is incident on a parallel glass slab at a point A as shown It undergoes partial reflection and refraction At each reflection 25% of incident energy is reflected The rays AB and A’ B’ undergo interference The ratio 
A ray of light of intensity I is incident on a parallel glass slab at a point A as shown It undergoes partial reflection and refraction At each reflection 25% of incident energy is reflected The rays AB and A’ B’ undergo interference The ratio
physics-General
physics-
A plane polarized beam of intensity I is incident on a polariser with the electric vector inclined at 30o to the optic axis of the polariser passes through an analyzer whose optic axis is inclined at 30o to that of polariser Intensity of light coming out of the analyzer is
A plane polarized beam of intensity I is incident on a polariser with the electric vector inclined at 30o to the optic axis of the polariser passes through an analyzer whose optic axis is inclined at 30o to that of polariser Intensity of light coming out of the analyzer is
physics-General
physics-
Fig shows a double slit experiment, P and Q are the two coherent sources The path lengths PY and QY are n and (n + 1) respectively where n is whole number and is wavelength Taking the central bright fringe as zero, what is formed at Y?
Fig shows a double slit experiment, P and Q are the two coherent sources The path lengths PY and QY are n and (n + 1) respectively where n is whole number and is wavelength Taking the central bright fringe as zero, what is formed at Y?
physics-General
chemistry-
Two liquids 
and 
are made of same atoms, with following properties
A and Bare respectively
Two liquids and are made of same atoms, with following properties
A and Bare respectively
chemistry-General
chemistry-
Product (C) is:
Product (C) is:
chemistry-General
physics-
A beam of light AO is incident on a glass slab (m = 1.5(D) in the direction shown The reflected ray OB is passed through a Nicol prism On viewing through a Nicol prism, we find on rotating the prism that
A beam of light AO is incident on a glass slab (m = 1.5(D) in the direction shown The reflected ray OB is passed through a Nicol prism On viewing through a Nicol prism, we find on rotating the prism that
physics-General
chemistry-
Consider the following reaction and identify (b) 
Consider the following reaction and identify (b)
chemistry-General
chemistry-
Give the decreasing order of the reaction rates of the following benzyl with HBr
Give the decreasing order of the reaction rates of the following benzyl with HBr
chemistry-General
chemistry-
The product (x) and (y) are:
The product (x) and (y) are:
chemistry-General
physics-
Coherent light is incident on two fine parallel slits 
and 
as shown in fig If a dark fringe occurs at P, which of the following gives possible phase differences for the light waves arriving at P from and ?
Coherent light is incident on two fine parallel slits and as shown in fig If a dark fringe occurs at P, which of the following gives possible phase differences for the light waves arriving at P from and ?
physics-General
chemistry-
There are two paths (I and II) for the preparation of phenyl-2,4-dinitro phenyl ether
Which of the following statements is true?
Path I is feasible, whereas path II is not
Path II is feasible, whereas path I is not
iii. The Cl of (a) undergoes SN reaction because it is activated by the two EWG
groups
iv. The nitration of (c) does not give (b) but it gives because the first nitro group is deactivating, so the second nitro group enters the other ring
There are two paths (I and II) for the preparation of phenyl-2,4-dinitro phenyl ether
Which of the following statements is true?
Path I is feasible, whereas path II is not
Path II is feasible, whereas path I is not
iii. The Cl of (a) undergoes SN reaction because it is activated by the two EWG groups
iv. The nitration of (c) does not give (b) but it gives because the first nitro group is deactivating, so the second nitro group enters the other ring
chemistry-General
physics-
In the set up shown, the two slits are not equidistant from the slit S.
The central fringe at O is then
In the set up shown, the two slits are not equidistant from the slit S.
The central fringe at O is then
physics-General
chemistry-
Homolytic bond fission of a covalent single bond gives rise to free radicals. Owing to the presence of an odd electron, free radicals are highly reactive. They have planar to pyramidal geometry depending upon the groups attached to the C-atom having odd electron. Alkyl free radicals are stabilised by hyperconjugation whereas allyl and benzyl free radicals are stabilised by resonance. They are formed as intermediates in the reaction mixture either in the gaseous phase or in non-polar solvents. Addition of HBr to alkenes in presence of peroxide, the substitution of allylic or benzylic hydrogen by ‘Cl’ at high temperature or by ‘Br’ in presence of NBS are examples of reactions involving free radical intermediates.
Arrange the following free radicals in the decreasing order of their stability. 
Homolytic bond fission of a covalent single bond gives rise to free radicals. Owing to the presence of an odd electron, free radicals are highly reactive. They have planar to pyramidal geometry depending upon the groups attached to the C-atom having odd electron. Alkyl free radicals are stabilised by hyperconjugation whereas allyl and benzyl free radicals are stabilised by resonance. They are formed as intermediates in the reaction mixture either in the gaseous phase or in non-polar solvents. Addition of HBr to alkenes in presence of peroxide, the substitution of allylic or benzylic hydrogen by ‘Cl’ at high temperature or by ‘Br’ in presence of NBS are examples of reactions involving free radical intermediates.
Arrange the following free radicals in the decreasing order of their stability.
chemistry-General
chemistry-
Homolytic bond fission of a covalent single bond gives rise to free radicals. Owing to the presence of an odd electron, free radicals are highly reactive. They have planar to pyramidal geometry depending upon the groups attached to the C-atom having odd electron. Alkyl free radicals are stabilised by hyperconjugation whereas allyl and benzyl free radicals are stabilised by resonance. They are formed as intermediates in the reaction mixture either in the gaseous phase or in non-polar solvents. Addition of HBr to alkenes in presence of peroxide, the substitution of allylic or benzylic hydrogen by ‘Cl’ at high temperature or by ‘Br’ in presence of NBS are examples of reactions involving free radical intermediates.
3, 5–dimethylcyclopentene reacts with N–bromosuccinimide (NBS) in CCl4 in presence of light or peroxide. Identify the product.
Homolytic bond fission of a covalent single bond gives rise to free radicals. Owing to the presence of an odd electron, free radicals are highly reactive. They have planar to pyramidal geometry depending upon the groups attached to the C-atom having odd electron. Alkyl free radicals are stabilised by hyperconjugation whereas allyl and benzyl free radicals are stabilised by resonance. They are formed as intermediates in the reaction mixture either in the gaseous phase or in non-polar solvents. Addition of HBr to alkenes in presence of peroxide, the substitution of allylic or benzylic hydrogen by ‘Cl’ at high temperature or by ‘Br’ in presence of NBS are examples of reactions involving free radical intermediates.
3, 5–dimethylcyclopentene reacts with N–bromosuccinimide (NBS) in CCl4 in presence of light or peroxide. Identify the product.
chemistry-General
chemistry-
When isobutene is brominated, the percentage of 
would be approximately
When isobutene is brominated, the percentage of would be approximately
chemistry-General
