1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
If $$\lambda $$v, $$\lambda $$x and $$\lambda $$m represent the wavelengths of visible light, X-rays and microwaves respectively, then
A
$${\lambda _m} > {\lambda _x} > {\lambda _v}$$
B
$${\lambda _m} > {\lambda _v} > {\lambda _x}$$
C
$${\lambda _v} > {\lambda _x} > {\lambda _m}$$
D
$${\lambda _v} > {\lambda _m} > {\lambda _x}$$
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
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