A discharge tube contains helium at a low pressure. A large potential difference is applied across the tube. Consider a helium atom that has just been ionized due to the detachment of an atomic electron. Find the ratio of the distance travelled by the free electron to that by the positive ion in a short time `dt` after the ionization.`

In a discharge tube when 200 volt potential difference is applied 6.25xx10^(18) electrons move from cathode to anode and 3.125xx10^(18) singly charged positive ions move from anode to cathode in one second. Then the power of tube is:

In a discharge tube when 200 volt potential difference is applied 6.25xx10^(18) electrons move from cathode to anode and 3.125xx10^(18) singly charged positive ions move from anode to cathode in one second. Then the power of tube is:

A current is established in a gas discharge tube where a sufficiently high potential difference is applied across the two electrodes in the tube. The gas ionises , electrons move toward positive terminal and positive ions toward the negative. What are the magnitude and sense of the current in a hydrogen discharge tube in which 3.1 xx 10^18 electrons and 1.1 xx 10^18 protons move past a X-sectional area of the tube each second ?

The ratio between acceleration of the electron in singlely ionized helium atom and doublely ionized lithium atom (both in ground state) is (x/27). Find value of x.

A molecule of a gas, filled in a discharge tube, gets ionized when an electron is detached from it. An electric field of 5.0 kV m^(-1) exists in the vicinity of the event. (a) Find the distance travelled by the free electron in 1 mus assuming no collision. (b) If the mean free path of the electron is 1.0 mm , estimate the time of transit of the free electron between successive collisions.