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Biology; Chemistry; Physics: Post your doubts here!

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the first one.....
if you make the image of student Z and X,
then make rays touching corner of mirror from Y (extended behind mirror) this way you get region visible by student Y
the images of X and Z fall in the region so student Y see himself,Z and X SO ANSWER IS 3 THAT IS D
for 2nd one....
the answer is A (i think :p)
as the voltage is less and more turns in secondary coil increase voltage , rest remains same so A seems right......
 
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There's this question that describe a method to determine whether a piece of metal emits gamma rays. Do we use the Wilson could chamber thingy or the gm tube by measuring the count rate by placing a paper then aluminum and then lead infront of the detector?
 
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There's this question that describe a method to determine whether a piece of metal emits gamma rays. Do we use the Wilson could chamber thingy or the gm tube by measuring the count rate by placing a paper then aluminum and then lead infront of the detector?
Both are fine.
 
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