1
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is
A
4.8$$\pi $$$$\mu $$V
B
0.8$$\pi $$$$\mu $$V
C
1.6$$\pi $$$$\mu $$V
D
3.2$$\pi $$$$\mu $$V
2
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.
3
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The number of photo electrons emitted for light of a frequency $$\upsilon $$ (higher than the threshold frequency $${\upsilon _0}$$) is proportional to
A
threshold frequency $$\left( {{\upsilon _0}} \right)$$
B
intensity of light
C
frequency of light $$\left( {{\upsilon _0}} \right)$$
D
$$\upsilon - {\upsilon _0}$$
4
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec. on the average at a target irradiated by this beam is
A
3 $$ \times $$ 1016
B
$$9 \times {10^{15}}$$
C
$$3 \times {10^{19}}$$
D
$$9 \times {10^{17}}$$
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