1
JEE Main 2016 (Offline)
+4
-1
A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h / $$\lambda$$ (where $$\lambda$$ is wavelength associated with electron wave) is given by :
A
2meV
B
$$\sqrt {meV}$$
C
$$\sqrt {2meV}$$
D
meV
2
JEE Main 2015 (Offline)
+4
-1
Which of the following is the energy of a possible excited state of hydrogen?
A
–6.8 eV
B
–3.4 eV
C
+6.8 eV
D
+13.6 eV
3
JEE Main 2014 (Offline)
+4
-1
The correct set of four quantum numbers for the valence elections of rubidium atom (Z= 37) is:
A
5, 1, 1, + 1/2
B
5, 1, 0, + 1/2
C
5, 0, 0, + 1/2
D
5, 0, 1, + 1/2
4
JEE Main 2013 (Offline)
+4
-1
Energy of an electron is given by $$E = - 2.178 \times {10^{ - 18}}J\left( {{{{Z^2}} \over {{n^2}}}} \right)$$. Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be
(h = 6.62 × 10−34 Js and c = 3.0 × 108 ms−1)
A
2.816 × 10−7 m
B
6.500 × 10−7 m
C
8.500 × 10−7 m
D
1.214 × 10−7 m
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