IIT-JEE Exam

In a hydrogen like atom electron makes transition
from an energy level with quantum number n to
another with quantum number (n – 1). If n >> 1,
the frequency of radiation emitted is proportional
to -

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IIT-JEE Other Question

Two short bar magnets of length 1 cm each have
magnetic moments 1.20 Am2 and 1.00 Am2
respectively. They are placed on a horizontal table
parallel to each other with their N poles pointing
towards the South. They have a common magnetic
equator and are separated by a distance of 20.0
cm. The value of the resultant horizontal magnetic
induction at the mid-point O of the line joining
their centres is close to In an LCR circuit both switches
are open initially. Now switch S1 is closed S2 kept
open. (q is charge on the capacitor and τ = RC is
Capacitive time constant). Which of the following
statement is correct ?
(1) At t = 2τ, q = CV (1 – e–2)
(2) At t =
2
τ , q = CV (1 – e–1)
(3) Work done by the battery is half of the energy
dissipated in the resistor
(4) At t = τ, q = CV/2