Practicals Flashcards
Measuring terminal velocity of ball bearing
Elastic bands on tube at fixed distances
Record time reaches each band
Repeat and average times
Average velocity increases then constant
Working out what affects terminal velocity
Change liquid
Change size
Change shape
Change mass
Measuring g of free fall
Height measure
Switch start time and drop ball
H=0.5gt^2
How distance affects the motion of trolley on a slope
Lengthy of trolley angle measured
Time
Change starting position
How collisions affect trolley on ramp
Video trolley hitting ram use frames per second
Velocity=l/t
Finding Resistivity of wire
Cross sectional area Length Voltmeter Ammeter R=V/I Plot resistance against length Gradient = p/A Multiply by A
IV graphs showing how resistance varies
Variable resistor to alter the pd and current
record v and I
Repeat
Plot current against pd
How do you investigate internal resistance and emf?
Vary current by change load resistance using variable
Measure pd at different currents
V=-RI + e
Gradient is -r
How can you modify a potential divider?
Add LDR thermistor or temperature sensor
What happens when you shine white light through a diffraction grating?
Spectra
Red on the outside
Microwave interference experiment
Two microwave transmitter comes attached to same signal generator
Receiver probe move up and down
Polarising microwaves
Metal grille
Transmitter waves are vertically polarised
Voltmeter decreases with intensity
When lines are aligned there is no signal
Using stationary waves to measure the speed of sound
Hollow tube
Tuning fork shows frequency
When sound is loudest
Quarter wavelength
How do you use LEDs to find the Planck constant?
LED lights up with current
record voltages and the wavelength emitted
Repeat with different wavelength LEDs
Plot graph of voltage against 1/wavelength
Gradient hc/e
Gold leaf electroscope
Zinc plate uv light eject drops
