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1
JEE Main 2021 (Online) 16th March Morning Shift
Numerical
+4
-1
The first spectral lines of H-atom in the Balmer series are
given $$\lambda$$1, $$\lambda$$2, $$\lambda$$3 considering the Bohr atomic model, the wave lengths of first and third spectral lines $$\left( \frac{\lambda_{1} }{\lambda_{3} } \right) $$ are related by a factor of approximately 'x' $$\times$$ 10$$-$$1.

The value of x, to the nearest integer, is _________.
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2
JEE Main 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
Change Language
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)
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3
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 __________.
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4
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:
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