1
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
The wavelength of an X-ray beam is 10$$\mathop A\limits^o $$. The mass of a fictitious particle having the same energy as that of the X-ray photons is $${x \over 3}h$$ kg. The value of x is __________. (h = Planck's constant)
Your input ____
2
JEE Main 2020 (Online) 2nd September Morning Slot
Numerical
+4
-0
When radiation of wavelength $$\lambda $$ is used to
illuminate a metallic surface, the stopping
potential is V. When the same surface is
illuminated with radiation of wavelength 3$$\lambda $$,
the stopping potential is
$${V \over 4}$$. If the threshold
wavelength for the metallic surface is n$$\lambda $$ then
value of n will be __________.
Your input ____
3
JEE Main 2020 (Online) 8th January Evening Slot
Numerical
+4
-0
The first member of the Balmer series of
hydrogen atom has a wavelength of 6561 Å.
The wavelength of the second member of the
Balmer series (in nm) is:
Your input ____
Questions Asked from Atoms and Nuclei (Numerical)
Number in Brackets after Paper Indicates
No. of Questions
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