1
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The electric field part of an electromagnetic wave in a medium is represented by Ex = 0;

$${E_y} = 2.5{N \over C}\cos \left[ {\left( {2\pi \times {{10}^6}{{rad} \over m}} \right)t - \left( {\pi \times {{10}^{ - 2}}{{rad} \over s}} \right)x} \right];$$

Ez = 0.
A
moving along x direction with frequency 106 Hz and wavelength 100 m.
B
moving along x direction with frequency 106 Hz and wavelength 200 m.
C
moving along $$-$$x direction with frequency 106 Hz and wavelength 200 m.
D
moving along y direction with frequency $$2\pi \times {10^6}\,Hz$$ and wavelength 200 m.
2
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity. $$\overrightarrow V = v\widehat i$$. The magnetic field is directed along the negative z axis direction. The induced emf, during the passes of these loops, out of the field region, will not remain constant for
A
The circular and the elliptical loops
B
only the ellliptical loop
C
any of the four loops
D
the rectangular, circular and elliptical loops
3
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The mean free path of electrons in a metal is 4 $$ \times $$ 10$$-$$8 m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m
A
$$5 \times {10^{ - 11}}$$
B
8 $$ \times $$ 10$$-$$11
C
5 $$ \times $$ 107
D
8 $$ \times $$ 107
4
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

AIPMT 2009 Physics - Dual Nature of Radiation and Matter Question 50 English
A
Curves (a) and (b) represent incident radiations of same frequency but of different intensities.
B
Curves (b) and (c) represent incident radiations of different frquencies and different intensities.
C
Curves (b) and (C) represent incident radiations of same frequency having same intensity.
D
Curves (a) and (b) represent incident radiations of different frequencies and different intensities