1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
In a circuit L, C and R are connected in series with an alternating voltage source of frquency $$f.$$ The current leads the voltage by 45o. The value of C is
A
$${1 \over {\pi f\left( {2\pi f\,L - R} \right)}}$$
B
$${1 \over {2\pi f\left( {2\pi f\,L - R} \right)}}$$
C
$${1 \over {\pi f\left( {2\pi f\,L + R} \right)}}$$
D
$${1 \over {2\pi f\left( {2\pi f\,L + R} \right)}}$$
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 $$\mathop A\limits^ \circ $$ is of the order of
A
106 rad
B
10$$-$$2 rad
C
10$$-$$4 rad
D
10$$-$$6 rad.
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 $$\mathop A\limits^ \circ $$ is/are
A
A only
B
A and B only
C
all the three metals
D
none
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
A photosensitive metallic surface has work function, h$$\upsilon $$0. If photons of energy $$2h{\upsilon _0}$$ fall on this surface, the electrons come out with a maximum velocity of 4 $$ \times $$ 106 m/s. When the photon energy is increased to 5 h$$\upsilon $$0, then maximum velocity of photoelectrons will be
A
2 $$ \times $$ 107 m/s
B
2 $$ \times $$ 106 m/s
C
8 $$ \times $$ 106 m/s
D
8 $$ \times $$ 105 m/s