Questions in Dual Nature of Radiation and Matter

Select	Question
	An electron is accelerated through a potential difference of 1000 volts. Its velocity is nearly
	In an electron gun the control grid is given a negative potential relative to cathode in order to
	The ratio of momenta of an electron and an $\alpha - $particle which are accelerated from rest by a potential difference of 100 V is
	When subjected to a transverse electric field, cathode rays move
	The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by
	In Millikan oil drop experiment, a charged drop of mass $1.8 \times {10^{ - 14}}kg$is stationary between its plates. The distance between its plates is 0.90 cm and potential difference is 2.0 kilo volts. The number of electrons on the drop is
	The charge on electron was discovered by
	From the following, what charges can be present on oil drops in Millikan's experiment (Here e is the electronic charge)
	A narrow electron beam passes undeviated through an electric field $E = 3 \times {10^4}volt/m$and an overlapping magnetic field $B = 2 \times {10^{ - 3}}Weber/{m^2}$. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is
	In Thomson's method of determining e/m of electrons