physics Flashcards
what is the same as 36 gigajoules?
36*10^9
the student calculated the total resistance of the two resistors to be 26 oms tell me why he was wrong
total resistance is smaller than the smallest individual resistor
total resistance is smaller than 20 oms
explain how power station x increases the efficiency of the national grid
-X increases the potential difference
-Current will be decreased
-less power dispatched from the transimssion cable
why is each street less than the current secondary coil transformer y?
street lamps are connected in parralel
explain what happens to resistor R when light intensity decreases
As light intensity decreases, the resistance of the LDR increases, causing the potential difference across resistor
𝑅
R to decrease.
what name is given to the process when other scientists check the jobs
peer review
what property of nuclear radiation causes the increased risk of cancer
ionising
what is unit for activity of a radio active source
bq
explain why the rate count-rate is less than activity of the sample
radiation is emitted in any direction
some radiation is not picked up by the detector
observing the toy from position B instead of position A affected the results why
because position b in is line with the toy so measurement will be more accurate
explain why the childs toy on its own is not an enclosed system
because energy is being transfered to the surroundings from the toy
a closed system would have the same total energy
explain how pressure in the chamber changes
the pressure increases
particles move faster
causes more collision between them
what property of air allows a small change internal energy to cause a large temp change to the air in the chamber
specific heat capacity
