1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A thin prism having refracting angle 10o is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting angle of second prism should be
A
6o
B
8o
C
10o
D
4o
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light $$I$$0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45o with that of P1. The intensity of transmitted light through P2 is
A
$${{{I_0}} \over 4}$$
B
$${{{I_0}} \over 8}$$
C
$${{{I_0}} \over 16}$$
D
$${{{I_0}} \over 2}$$
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is
A
$${h \over {\sqrt {3mkT} }}$$
B
$${{2h} \over {\sqrt 3 mkT}}$$
C
$${{2h} \over {\sqrt {mkT} }}$$
D
$${h \over {\sqrt {mkT} }}$$
4
NEET 2017
MCQ (More than One Correct Answer)
+4
-1
The photoelectric threshold wavelength of silver is 3250 $$ \times $$ 10$$-$$10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 $$ \times $$ 10$$-$$10 m is
{Given h = 4.14 $$ \times $$ 10$$-$$15 eV s and c = 3 $$ \times $$ 108 m s$$-$$1 ]
A
$$ \approx $$ 0.6 $$ \times $$ 106 m s$$-$$1
B
$$ \approx $$ 61 $$ \times $$ 103 m s$$-$$1
C
$$ \approx $$ 0.3 $$ \times $$ 106 m s$$-$$1
D
$$ \approx $$ 6 $$ \times $$ 105 m s$$-$$1
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