KVPY Government Jobs Exams

In a Young's double slit set-up, light from a laser source falls on a pair of very narrow slits separated by 1.0
micrometer and bright fringes separated by 1.0 millimeter are observed on a distant screen. If the frequency
of the laser light is doubled, what will be the separation of the bright fringes ?
(A) 0.25 mm (B) 0.5 mm (C) 1.0 mm (D) 2.0 mm

Read Solution (Total 0)

KVPY Other Question

At 23ºC, a pipe open at both ends resonates at a frequency of 450 hertz. At what frequency does the same
pipe resonate on a hot day when the speed of sound is 4 percent higher than it would be at 23ºC ?
(A) 446 Hz (B) 454 Hz (C) 468 Hz (D) 459 Hz An electron collides with a free molecules initially in its ground state. The collision leaves the molecules in
an excited state that is metastable and does not decay to the ground state by radiation. Let K be the sum of
the initial kinetic energies of the electron and the molecule, and P
r
the sum of their initial momenta. Let K'
and P' represent the same physical quantities after the collision. Then -
(A) K = K', P = P' (B) K' < K, P = P' (C) K = K', P ≠ P' (D) K' < K, P ≠ P'