Feb mock practise Flashcards
State the energy transfer taking place in the solar cells
Light energy ——> electrical energy
why are solar cells not connected in series
Because if one stops working, the rest can keep producing solar energy
State the uses of UV light
Killing bacteria
Used in fluorescent lamps
Similarities with waves in EM spectrum
They all travel at the same speed in free space.
How to find the density of an irregular object e.g. bolt
Find the volume of the bolt using the displacement method
-Submerge bolt in a eureka can with water to find volume.
-The volume is the water spilled out into the measuring cylinder
-Read at eye level to avoid parallax errors
-Use density = mass/ volume
State factors affecting stopping distance of a car
The quality of the brakes in the car
-age
-alcohol
tiredness
-Mass of car
-The road conditions
How does fiberglass wool trapping air reduce thermal energy loss
-Trapped air means it can’t move so the energy has to conduct slowly through pockets of air
-Fiberglass wool has a low thermal conductivity
What is the name of the image formed when an object is reflected in a mirror
A virtual image
Control variables in experiment with gas and volume
The temperature of gas
Mass of gas
Relationship between gas and its volume
They are inversely proportional, as one increases the other decreases
What piece of equipment is needed to measure count-rate?
A Geiger muller detector
How to improve reliability of results
Repeat the experiment 3-5 times and get an average!
