ELECTRONIC AND LINE IMPERFECTIONS

STATEMENT-1 : In the absence of current in a counducting wire, the random motionof electrons is zig-zag with electrons moving in a straight line between two successive collisions. and STATEMENT-2 : When a c urrent is set up, the path of electrons between two successive collisions becomes curved.

The accuracy in a measurement may depend on several factors like (I) Personal erroes (II) Imperfection in technique/procedure (III) Instrumental errors, Random error (IV) Resolution of measuring instrument Which the following is true ?

The second line in Paschen series is obtained when the electron makes transition from

Which one is correctly matched ? (a) Agaricus - Smut (b) Ustilago - Mushroom (c) Puccinia - Insectivorous plant (d) Deuteromycetes - Imperfect fungi

In hydrogen spectrum L_(alpha) line arises due to transition of electron from the orbit n=3 to the orbit n=2. In the spectrum of singly ionized helium there is a line having the same wavelength as that of the L_(alpha) line. This is due to the transition of electron from the orbit:

Assertion (A) : Limiting line is the balmer series has a wavelength of 364.4 nm Reason (R ) : Limiting line is obtained for a jump electron from n = infty

A: In Bohr model , the frequency of revolution of an electron in its orbit is not connected to the frequency of spectral line for smaller principal quantum number n. R: For transitions between large quantum number the frequency of revolution of an electron in its orbit is connected to the frequency of spectral line, as per Bohr's Correspondence principle.

When electronic transition occurs from higher energy state to lower energy state with energy difference equal to Delta E electron volts , the wavelength of the line emitted is approximately equal to

When electronic transition occurs from higher energy state to lower energy state with energy difference equal to Delta E electron volts , the wavelength of the line emitted is approxmately equal to

an electron is released from rest in a region of uniform electric and magnetic field acting parallel to each other. The electron will (A) move in a straight line (B) move in a circle (C) remain stationary (D) move in a helical path