Extra paper 1 Flashcards
What are some uses of ultrasound?
Baby scanner, cleaning jewellery and detecting kidney stones.
What is a use of infrasound?
Studying the earths structure.
What can a student do to prove that angle y is directly proportional to angle x?
Gather more information and use a wider range of angle x. Repeat.
How should a teacher use a GM tube to compare count rates of two different rocks?
Measure background radiation and place one rock at a set distance from a tube and measure the count for a set time. Subtract the background radiation and remove the rock to do it with the other one. Repeat readings and take averages.
What keeps satellites in orbit?
Centripetal force.
How does the vibrating of a tuning fork cause a sound wave to travel through the air?
Sound waves are longitudinal and the vibrations are parallel to the direction of the wave.
Why is light split up when it enters a prism?
Different colours have different wavelengths and if it is not in a vacuum, different wavelength light travels at different speed which means they refract by different amounts causing the white light to split up into different colours of the spectrum.
What is a unit for measuring acceleration due to gravity but not m/s2?
N/Kg
What is one way an experiment can be improved regarding measuring acceleration?
Use a computer/data logger to record time and eliminate human error due to reaction time.
Why are renewable sources providing an increasing fraction of the electricity supply for many countries?
Non-renewable sources such as coal are running out so get used less which means renewable resources get used more so are an increasing fraction(demand does not go down).
How could a student collect data to show how the rate of cooling changes with time?
Use thermometer to measure temperature and a stop clock to measure time. Measure temperature at regular intervals.
Why does a lamp increase in heat but then remain at a constant value?
Temperature rise is due to more energy being absorbed than being emitted. Constant temperature is due to the energy being absorbed being equal to the energy being emitted.
How could the student compensate for effects of friction(investigating acceleration).
Detach the weight hanger and raise the runway so the trolley just starts to fall and then re-attach weight hangar.
Explain how momentum is conserved using newtons second and first law.
Momentum=mass x velocity.
For every action there is an equal opposite reaction so when they collide force of R on Q=-force of Q on R.
Change in momentum of Q=-change in momentum of R.
Momentum lost by Q has been gained by R as momentum is conserved.
Momentum at start=at end.
Why is a very high temperature needed for fusion?
The two hydrogen nuclei have same charge so repel each other. Very high temp is needed so nuclei have high energy and speed to create impact force large enough to overcome force of repulsion.
