Waves Flashcards
Describe an investigation a student could complete when investigation the refraction of light at an air to glass boundary
Include possible innacuracy
1) Place a glass block on a piece of paper and draw around the block, draw the normal 90 degrees to one side of the block
2) Use a protractor to measure and draw a line at an angle of 20 degrees to the normal
3) Then place glass block using ray box and slit point the ray of light down the drawn light
4) Mark the ray of light emerging, remove the block and draw in refracted ray, measure angle of refraction with protractor
5) Repeat steps 1-4 for a range of values of the angle of incidence
6) Possible source of inaccuracy is the width of light ray which makes it difficult to judge the centre of the ray
Explain why the image height in centimetres was the same as the magnification
Magnification = image height/object height
Dividing by an object of 1cm gives same numerical value
It would be difficult to obtain accurate magnification values for distances greater than 60cm
Suggest one change that can be made so that accurate magnification values could be obtained for distances greater than 60cm
Use a travelling microscope
Describe how the wavelength of the water waves in a ripple tank can be measured accurately
Use a metre rule to measure across 10 projected waves
Then divide by 10
What is the typical walking speed of a human
1.5m/s
Suggest a change to produce a wave with a lower frequency
Use springs with smaller spring constant
Give three parts of electromagnetic spectrum used for communications
Visible light
Microwaves
Radio waves
Describe how you could use equipment to compare the infrared radiation emitted from the vertical surface of the cube
Pour hot water into the cube
Point the infrared red radiation detector at each side and take a reading
Keep the detector the same distance from each surface
Describe a method the student could use for the investigation of how the speed of the wave on a stretched spring depends on the tension in the spring
Add or take away masses from the string
Adjust frequency using highland generator or move wooden bridge
Observe a steady pattern and measure wavelength
Calculate wave speed from frequency and wavelength
What are periods measure in
Seconds (s)
Why does the white t -shirt look white in white light
T shirt reflects all wavelengths of light equally
Explain how the colour of the baseball cap appears to change when the room lights at the party change from white to blue
Changes from red to black
As the cap absorbs all the blue light
