Light of wavelength 600 nm is incident normally on a slit of width 0.03 cm. The width of the central maximum on the screen placed 1 m away from the slit is

Match List - I with List - II.

List - I	List - II
(A) Orbital radius of electron	(I) \( \propto \frac{1}{n} \)
(B) Orbital velocity of electron	(II) \( \propto n \)
(C) Orbital frequency of electron	(III) \( \propto \frac{1}{n^3} \)
(D) Angular momentum of electron List	(IV) \( \propto n^2 \)

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The angle of dip at a location in Southern India is about 18°. Which of the following is correct for dip angle in Britain ?
(A) Dip angle will be greater in Britain than in India.
(B) Dip angle will be smaller in Britain than in India.
(C) Nearer the place to the poles, lesser is the dip angle.
(D) Nearer the place to the poles, more is the dip angle.
(E) Dip angle is also called the angle of declination.

Choose the incorrect statements from the following:
(A) The energy density of an electric field in electromagnetic waves is \( (\epsilon_0 E^2/2) \).
(B) The total energy of electromagnetic waves falling on a surface is \( E = 6.0 \times 10^5 \text{ J} \) and the momentum delivered to the surface, if absorbed fully, is \( p = 2 \times 10^3 \text{ kg m/s} \).
(C) The speed of the electromagnetic waves is \( E_0 / B_0 \).
(D) The energy density of magnetic field in electromagnetic Waves is \( (B^2 / \mu) \).
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A square loop is placed near a long straight current carrying wire as shown in figure. If the loop is moved away from the wire

igure given below shows variation of photocurrent with anode potential for different intensities of incident radiation. Some of the results obtained from the experiments are described below on the basis of the graph. Identify the correct results:

(A) The photoelectric current is higher for higher intensity of the incident radiation.
(B) The negative potential required to decrease the photocurrent at different intensities to zero is different.
(C) If the positive potential of the anode is increased beyond a certain value, the photocurrent does not increase for a given intensity.
(D) If the potential applied at the anode is zero, then the photocurrent is lower than the maximum value of current for the given intensity.
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Identify the correct statements among the following.
(A) At 0 K, the resistance of a semiconductor is infinite.
(B) In an n-type semiconductor, the electron concentration is approximately equal to the concentration of donor atoms.
(C) In p-type semiconductors, the acceptor levels lie near the conduction band.
(D) In n-type semiconductors, the charge carriers are both electrons and holes.
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A student is asked to observe his face in three different types of mirrors P, Q, R one by one by holding each mirror close to his face at same distance. Mirror P given exact and same size image, Q gives exact but smaller while R gives exact but larger image.
A. P is Convex mirror, Q is Plane, R is Concave
B. P is Plane, Q is Convex, R is Concave
C. P is Concave, Q is Plane, R is Convex
D. P is Convex, Q is Concave, R is Plane
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In an electromagnetic wave, the ratio of energy densities of electric and magnetic fields is :

A common emitter amplifier has a current gain 75. The collector resistance is 4 \( k\Omega \) and the input resistance is 500 \( \Omega \). The voltage gain of amplifier is:

The point which does not lie in the half plane \(2 x+3 y-12 \leq 0\) is:

The derivative of \(\sin \left(\tan ^{-1} e^{2 x}\right)\) with respect to x is:

The correct order of dipole moment of the different methyl halides is :