Year 12 Practicals

Question 1

For Practical 1, (stationary waves on a string) what are the independent and dependent variables? (method 1 varying length)

Answer 1

Independent -> Length of string between vibration generator and bridge
Dependent -> Frequency of oscillations

Question 2

For Practical 1, (stationary waves on a string) what are the control variables? (method 2 varying mass)

Answer 2

Control -> Length of string between vibration generator and bridge, mass per unit lenght of string

Question 3

For Practical 2, (interference of light) what are the control variables? (Method 1 Double Slit)

Answer 3

Control -> Wavelength of laser, slit separation

Question 4

For Practical 2, (interference of light) what is the dependent variable? (Method 2 Diffraction Grating)

Answer 4

Independent -> N/A
Dependent -> Angle between maximum and central maximum

Question 5

For Practical 3, (g by freefall) what are the control variables?

Answer 5

Control -> Initial ball velocity, acceleration due to gravity

Question 6

For Practical 4, (Young’s Modulus of Wire) what are the control variables?

Answer 6

Control -> Mass per unit length of string, cross sectional area of string

Question 7

For Practical 5, (Resistvity of Wire) what are the independent and dependent variables?

Answer 7

Independent -> Length of wire between crocodile clips
Dependent -> Resistance of wire (From PD and Current)

Question 8

For Practical 6, (Internal Resistance of Battery) what are the control variables?

Answer 8

Control -> emf of power source, internal resistance of power source

Question 9

For Practical 1, (stationary waves on a string) what are the control variables? (method 1 varying length)

Answer 9

Control -> Mass hanging on end of string, mass per unit lenght of string

Question 10

For Practical 1, (stationary waves on a string) what are the independent and dependent variables? (method 2 varying mass)

Answer 10

Independent -> Mass hanging on end of string
Dependent -> Frequency of oscillations

Question 11

For Practical 2, (interference of light) what are the independent and dependent variables? (Method 1 Double Slit)

Answer 11

Independent -> Distance from double slit to screen
Dependent -> Fringe width

Question 12

For Practical 2, (interference of light) what are the control variables? (Method 2 Diffraction Grating)

Answer 12

Control -> Wavelength of laser, number of slits per mm

Question 13

For Practical 3, (g by freefall) what are the independent and dependent variables?

Answer 13

Independent -> Height of release of ball
Dependent -> Time for ball to drop

Question 14

For Practical 4, (Young’s Modulus of Wire) what are the independent and dependent variables?

Answer 14

Independent -> Stress (masses on string)
Dependent -> Strain (Length between fixed end and marker)

Question 15

For Practical 5, (Resistvity of Wire) what are the control variables?

Answer 15

Control -> Cross sectional area of wire, Resistivity of wire, emf of power source

Question 16

For Practical 6, (Internal Resistance of Battery) what are the independent and dependent variables?

Answer 16

Independent -> Resistance of rheostat
Dependent -> Terminal potential difference

Question 17

For Practical 1, (stationary waves on a string) (method 1 varying length) What is the gradient of the graph?

Answer 17

Solve for** 𝜇**

Question 18

For Practical 2, (interference of light) What is the gradient of the graph? (Method 2 Diffraction Grating)

Answer 18

Solve for 𝜆

Question 19

For Practical 5, (Resistvity of Wire) What is the gradient of the graph?

Answer 19

Solve for 𝜌

Question 20

For Practical 1, (stationary waves on a string) What is the gradient of the graph? (method 2 varying mass)

Answer 20

Solve for 𝜇

Question 21

For Practical 2, (interference of light)What is the gradient of the graph? (Method 1 Double Slit)

Answer 21

Solve for 𝜆

Question 22

For Practical 3, (g by freefall) What is the gradient of the graph?

Answer 22

Solve for g

Question 23

For Practical 4, (Young’s Modulus of Wire) What is the gradient of the graph?

Answer 23

Solve for YM

Question 24

For Practical 6, (Internal Resistance of Battery) What information can you extract from the graph?

Answer 24