1
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization enegy of metal A in kJ mol$$-$$1 is __________. (Rounded off to the nearest integer)
[h = 6.63 $$\times$$ 10$$-$$34 Js, c = 3.00 $$\times$$ 108 ms$$-$$1, NA = 6.02 $$\times$$ 1023 mol$$-$$1]
[h = 6.63 $$\times$$ 10$$-$$34 Js, c = 3.00 $$\times$$ 108 ms$$-$$1, NA = 6.02 $$\times$$ 1023 mol$$-$$1]
Your input ____
2
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _________. (Integer answer)
(A) Li
(B) Na
(C) Rb
(D) Cs
(A) Li
(B) Na
(C) Rb
(D) Cs
Your input ____
3
JEE Main 2021 (Online) 24th February Morning Shift
Numerical
+4
-1
A proton and a Li3+ nucleus are accelerated by the same potential. If $$\lambda _{Li}$$ and $$\lambda _p$$ denote the
de Broglie wavelengths of Li3+ and proton respectively, then the value of
$${{{\lambda _{Li}}} \over {{\lambda _p}}}$$ is x $$ \times $$ 10-1.
The value of x is ______. (Rounded off to the nearest integer)
[Mass of Li3+ = 8.3 mass of proton]
The value of x is ______. (Rounded off to the nearest integer)
[Mass of Li3+ = 8.3 mass of proton]
Your input ____
4
JEE Main 2020 (Online) 2nd September Evening Slot
Numerical
+4
-0
The work function of sodium metal is
4.41 $$ \times $$ 10–19 J. If photons of wavelength 300 nm
are incident on the metal, the kinetic energy of
the ejected electrons will be (h = 6.63 $$ \times $$ 10–34 J s;
c = 3 $$ \times $$ 108 m/s) ________ × 10–21 J.
Your input ____
Questions Asked from Structure of Atom (Numerical)
Number in Brackets after Paper Indicates No. of Questions
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