JEE Main 2016 (Offline) | Structure of Atom Question 145 | Chemistry

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 :

2meV

$$\sqrt {meV} $$

$$\sqrt {2meV} $$

meV

JEE Main 2015 (Offline)

MCQ (Single Correct Answer)

-1

Which of the following is the energy of a possible excited state of hydrogen?

–6.8 eV

–3.4 eV

+6.8 eV

+13.6 eV

JEE Main 2014 (Offline)

MCQ (Single Correct Answer)

-1

The correct set of four quantum numbers for the valence elections of rubidium atom (Z= 37) is:

5, 1, 1, + 1/2

5, 1, 0, + 1/2

5, 0, 0, + 1/2

5, 0, 1, + 1/2

JEE Main 2013 (Offline)

MCQ (Single Correct Answer)

-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)

2.816 × 10⁻⁷ m

6.500 × 10⁻⁷ m

8.500 × 10⁻⁷ m

1.214 × 10⁻⁷ m

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