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|if two identical progressive waves propagating in opposite directions superpose each other then the resultant wave will be in the form of continuous loops and no energy is transferred in the medium.
|when a compressional wave is sent through an open pipe ,it gets reflected at the end of the pipe . these incident and reflected waves with same frequency in opp direction superimpose each other along the length of the pipe
|standing wave in open closed pipe
|if a vibrating tuning fork is kept at the open end of the pipe, then compressions and rarefactions starts moving inside the pipe and gets reflected and incident waves superpose with each other and stationary waves are formed
|the apparent change in frequency of sound when there is a relative motion between source and the observer
|it is a property of virtue by which the nucleus of a heavy element disintegrates itself by emitting radiation without any external agents influence
|the rate of radioactive decay at any instant is directly proportional to the no. of nuclei present at that instant
|radioactive decay law
|it is a device used to produce nuclear energy due to nuclear fission. works on the principle of controlled chain reaction.
|1.fuel 2.moderator 3.control rods 4.shielding 5.coolant
|5 essential features of a nuclear reactor
|when a steady current flows through a wire of uniform cross section ,the potential difference between any two points of the wire is directly proportional to the length of the wire
|principle of potentiometer