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Flashcards in Practicals Deck (16)
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1

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

2

Working out what affects terminal velocity

Change liquid
Change size
Change shape
Change mass

3

Measuring g of free fall

Height measure
Switch start time and drop ball
H=0.5gt^2

4

How distance affects the motion of trolley on a slope

Lengthy of trolley angle measured
Time
Change starting position

5

How collisions affect trolley on ramp

Video trolley hitting ram use frames per second
Velocity=l/t

6

Finding Resistivity of wire

Cross sectional area
Length
Voltmeter
Ammeter
R=V/I
Plot resistance against length
Gradient = p/A
Multiply by A

7

IV graphs showing how resistance varies

Variable resistor to alter the pd and current
record v and I
Repeat
Plot current against pd

8

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

9

How can you modify a potential divider?

Add LDR thermistor or temperature sensor

10

What happens when you shine white light through a diffraction grating?

Spectra
Red on the outside

11

Microwave interference experiment

Two microwave transmitter comes attached to same signal generator
Receiver probe move up and down

12

Polarising microwaves

Metal grille
Transmitter waves are vertically polarised
Voltmeter decreases with intensity
When lines are aligned there is no signal

13

Using stationary waves to measure the speed of sound

Hollow tube
Tuning fork shows frequency
When sound is loudest
Quarter wavelength

14

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

15

Gold leaf electroscope

Zinc plate uv light eject drops

16

Measuring the density of solids

Determine mass using mass balance
Measure volume
Irregular = volume of water displaced
p=m/v