Question #61367
19) The half-life of a certain radioactive isotope is 32 hours. What fraction of the sample would remain after 16 huors?
a) 0.50
b) 0.25
c) 0.62
d) 0.71
20) A potentiometer wire of length 100cm has a resistance of 10Ê. It is connected in series to to a resistance R and a cell of emf 2V and negligible internal resistance. A source of emf of 10mV is balanced by a length of 40cm of the potentiometer wire. What is the value of the resistance R?
a) 200Ê
b) 950Ê
c) 2000Ê
d) 790Ê
a) 0.50
b) 0.25
c) 0.62
d) 0.71
20) A potentiometer wire of length 100cm has a resistance of 10Ê. It is connected in series to to a resistance R and a cell of emf 2V and negligible internal resistance. A source of emf of 10mV is balanced by a length of 40cm of the potentiometer wire. What is the value of the resistance R?
a) 200Ê
b) 950Ê
c) 2000Ê
d) 790Ê
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#339914 on Dec 2023
#339914 on Dec 2023
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