mistake deck Flashcards
1
Q
a copper bar and a wooden bar are joined. A piece of paper is wrapped tightly around the join.
the bar is heated strongly at the centre for a short time, and the paper goes brown on one side only, which side goes brown and what does this show about wood and copper
A
ans
brown side wood, wood is an insulator and copper is a conductor
due to which wood will absorb the most heat and get hotter than copper as copper will dissipate the heat
2
Q
what are some reasons of difference in results in an electric experiment (P6)
A
cell could have lower voltage as its been used up
heat can be produced due to current/difference in temp
3
Q
Question about why half life about tracers is suitable [2m]
A
Long enough to determine leak but short enough that is disappears quickly
