Cathode rays produce ……………on the walls of the discharge tube.

The resistance of a discharge tube is

When cathode rays are focused on thin metal foil, it gets heated up to ……………

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 ?

Cathode rays are deflected towards _______.

What is the fate of the male gametes discharged in the synergid ?

A stream of water flowing horizontally with a speed of 15 m s^(-1) gushes out of a tube of cross-sectional area 10^(-2) m^2 , and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assuming it does not rebound ?

A discharge tube containing nitrogen gas at 25^(@)C in evacuated till the pressure is 2xx10^(-2) mm. If the volume of discharge tube is 2 litre. Calculate the number of nitrogen molecules still present in the tube (R=0*0821 L "atm mol"^(-1)K^(-1))