1
AIEEE 2012
+4
-1
In Young's double slit experiment , one of the slit is wider than other, so that amplitude of the light from one slit is double of that from other slit. If $${{\rm I}_m}$$ be the maximum intensity, the resultant intensity $${\rm I}$$ when they interfere at phase difference $$\phi$$ is given by :
A
$${{{I_m}} \over 9}\left( {4 + 5\cos \,\phi } \right)$$
B
$${{{I_m}} \over 3}\left( {1 + 2{{\cos }^2}\,{\phi \over 2}} \right)$$
C
$${{{I_m}} \over 3}\left( {1 + 4{{\cos }^2}\,{\phi \over 2}} \right)$$
D
$${{{I_m}} \over 9}\left( {1 + 8{{\cos }^2}\,{\phi \over 2}} \right)$$
2
AIEEE 2012
+4
-1
An electromagnetic wave in vacuum has the electric and magnetic field $$\mathop E\limits^ \to$$and $$\mathop B\limits^ \to$$, which are always perpendicular to each other. The direction of polarization is given by $$\mathop X\limits^ \to$$ and that of wave propagation by $$\mathop k\limits^ \to$$. Then
A
$$\mathop X\limits^ \to ||\mathop B\limits^ \to$$ and $$\mathop X\limits^ \to ||\mathop B\limits^ \to \times \mathop E\limits^ \to$$
B
$$\mathop X\limits^ \to ||\mathop E\limits^ \to$$ and $$\mathop k\limits^ \to ||\mathop E\limits^ \to \times \mathop B\limits^ \to$$
C
$$\mathop X\limits^ \to ||\mathop B\limits^ \to$$ and $$\mathop k\limits^ \to ||\mathop E\limits^ \to \times \mathop B\limits^ \to$$
D
$$\mathop X\limits^ \to ||\mathop E\limits^ \to$$ and $$\mathop k\limits^ \to ||\mathop B\limits^ \to \times \mathop E\limits^ \to$$
3
AIEEE 2012
+4
-1
An object $$2.4$$ $$m$$ in front of a lens forms a sharp image on a film $$12$$ $$cm$$ behind the lens. A glass plate $$1$$ $$cm$$ thick, of refractive index $$1.50$$ is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus of film?
A
$$7.2$$ $$m$$
B
$$24$$ $$m$$
C
$$3.2$$ $$m$$
D
$$5.6$$ $$m$$
4
AIEEE 2012
+4
-1
Hydrogen atom is excited from ground state to another state with principal quantum number equal to $$4.$$ Then the number of spectral lines in the emission spectra will be :
A
$$2$$
B
$$3$$
C
$$5$$
D
$$6$$
EXAM MAP
Joint Entrance Examination