Physics 1Pr June 2019 Flashcards
What happens to stars with higher mass than the sun after main sequence
- Become red super giant
- Supernova
- Neuronstar / blackhole
What does moderator do in nuclear fission power model
Reduce KE of neutrons
What is contamination in radioactivity
Non radioactive object come in contact with radio active material
What is irradiation in radioctivity
Radiation is present but not in contact
Process of nuclear fusion
- creation of large nucleus from small nuclei
- result in loss of mass
- release huge amount of energy
Requirement for fusion
- High temp
=> increase KE of nuclei - high pressure
=> nuclei need to be close enough to collide
=> since they repel
4 ways to transfer heat
- Mechanically (Force)
- Electrically (P.D)
- Heating ( hotter to colder)
- Radiation ( waves)
How plastic cover prevent water from being warm
- Plastic cover is insulator
and bad conductor of heat - Conduction is reduced
- Convection is reduced
- Less evaporation
Voltage and Current in series circuits
- current is same in all componet
-potential difference is shared
Voltage and current in parallel
- current is shared
In = split
Out = goes back to normal - potential difference is same in all component
Why we use bar chart instead of line graph
Indepent variable is
non - continuous variable
How parachute jumper achieved terminal velocity
- air resistance increase drastically when parachute open
- air resistance greater than height
- Decelerate
-air resistance decrease with speed - Resultant force eventually become zero
- constant speed achieved
Explain what happens to the wavelength of light when it passes from air into water.
Wavelength decrease because
- wave speed increase
- but frequency stays constant
path of the light ray shown in total internal reflection
- shows total internal reflection
- ray travelling from high to low refractive index
- angle of incidence is greater than the critical angle
Describe a method he could use to determine the shape and direction of the
magnetic field produced by a bar magnet with iron fillings
- put magnet under a paper
- sprinkle iron fillings on paper
- Tap to spread
