1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
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 (More than One Correct Answer)
+4
-1
Change Language
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
3
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is
A
1
B
4
C
0.5
D
2
4
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
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
$${h \over {\sqrt {mkT} }}$$