Qualification > Sciences
Physics Help HERE ONLY !!
winnie101:
RESISTANCE is proportional to 1/cross sectional area. so if u decrease the cross sectional area, the resistance inc, if u increase the cross sectional area resistance decreases, thats why its A
7ooD:
in addition to winnie when the resistance increase temperature increase so over here we need low resistance
theigstudent:
could some 1 tell me what is the threshold 4 A
The half-life of a radioactive substance is 5 hours. A sample is tested and found to contain 0.48 g
of the substance.
How much of the substance was present in the sample 20 hours before the sample was tested?
A 0.03 g
B 0.12 g
C 1.92 g
D 7.68 g
wats the answer 4 this n how do u find it
Ghost Of Highbury:
20/5 = 4
0.48 * 4 = 1.92 g
Tanya:
me tooo wanna know the answer i couldnt do it anyone cam help us????????????????1
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