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A police officer's stationary radar device indicates that the frequency of the radar wave reflected from automobile is less than the frequency emitted by the radar device. This indicates the automobile is?

Evaluate the commutator[Lx,Ly•Ly]•

A wave has a length of 2m and a frequency of 10Hz. Calculate the wave number . Calculate the angular frequency. Calculate wave speed


in which substance are free electrons involved in transfer of energy


why alpha decay occurs


Write down at least three precautions that must be adopted in order to perform the

experiment to study the characteristics of G.M tube


Write down the working principle of GM tube.


What is half-life and activity of strontium-90

Write down the apparatus used to investigate attenuation of radiations with absorption of beta particles. 


. Explain the phenomenon of avalanche produced in working of GM tube


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