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level: LAQs

Questions and Answers List

level questions: LAQs

Question	Answer
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.	stationary waves
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	closed pipe
the apparent change in frequency of sound when there is a relative motion between source and the observer	doppler effect
it is a property of virtue by which the nucleus of a heavy element disintegrates itself by emitting radiation without any external agents influence	radioactivity
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.	nuclear reactor
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