RPAs Flashcards
What graph do you plot to find the speed of a stationary wave?
1/ frequency of y axis and length on x axis
What is the gradient of the graph in the stationary waves practical equal to?
2/wave speed
What safety considerations must be made in the stationary waves practical?
Stand may topple over and cause injury so use a counterweight
What are 2 improvements that could be made to the stationary waves practical?
-Oscilloscope can be used to verify the signal generator’s readings
-Signal generator should be left for 20 minutes to stabilise
What is the independent variable in Young’s double slit experiment?
Distance from slits to screen
What is the dependent variable in Young’s double slit experiment?
The fringe separation
How do you find the fringe separation in Young’s double slit experiment?
Measure the length of 10 fringes then divide by 10
What graph do you plot for Young’s double slit experiment?
Fringe spacing on y axis and distance from slits to screen on x axis
What is the gradient of the graph in Young’s double slit experiment equal to?
Wavelength/slit separation
What safety consideration must be made in Young’s double slit and diffraction grating experiments?
Laser can damage eyes so do not look directly into it and don’t shine at reflective surfaces or near eye level
What improvements could be made to Young’s double slit and the diffraction rating experiments?
Use a set square to ensure screen and slits are aligned perfectly normal to the laser
What do you measure in the diffraction grating experiment?
Distance from grating to screen and distance between central maxima and nth order maxima
How do you calculate the angle in the diffraction grating experiment?
Tanx = distance from central to nth/distance to screen
What graph do you plot in the diffraction grating experiment?
dsinx on y axis and n on x axis
What is the gradient of the graph in the diffraction grating experiment equal to?
Wavelength
Why would you use the diffraction grating experiment over Young’s double slit?
It is easier to get a more accurate value for the wavelength
What is the independent variable in the determination of g by freefall method?
The height which the ball bearing falls for
What is the dependent variable in the determination of g experiment and how is it measured?
The time the ball takes to fall is measured by light gates
What graph do you plot in the determination of g experiment?
2h/t on y axis and t on x axis
What is the gradient of the graph in the determination of g experiment equal to?
Acceleration due to gravity
What safety considerations must be made in the determination of g experiment?
Stand may topple so use a counterweight
What else must be considered to ensure the accuracy of the determination of g? (2)
-Ball bearing should be dense to reduce effects of air resistance
-Keep distance between starting position and top light gate constant so ball always passes through top gate at same speed
What is the independent variable in the Young’s modulus experiment?
Force
What is the dependent variable in Young’s modulus experiment?
Extension
