Year 9 Science Revision Questions 2024 PDF

Year 9 Science Revision Questions - 2024 1. Define the term wave and give five examples of where waves transfer energy. Definition: A disturbance of the organised movement of water, air, and light Example Classification (transverse/ longitud...

Year 9 Science Revision Questions - 2024 1. Define the term wave and give five examples of where waves transfer energy. Definition: A disturbance of the organised movement of water, air, and light Example Classification (transverse/ longitudinal) Sound L Light T microwave T Ocean waves T UV T 2. Give a definition for the below. Wave Property Definition Diagram Frequency number of times a wave wave passes through a point per sec Wavelength Distance between crest and crest Amplitude Height from point zero energy to crest Period Time between crest and crest Trough Lowest point of wave Crest Highest point in wave. 3. Express the wave speed formula (wave equation) in mathematical terms v(speed/velocity) = ƛ(wavelength) * f (m/s) 4. How are the wavelength, frequency and wavelength related to each other? As shown in the formula, the wavelength speed equals tp the product of the frequency and the wavelength. This shows that as the wavelength speed increases, the frequency decreases. 5. What is the electromagnetic spectrum? The measurements of distances of wavelengths based on the distance, which is then put longest to shortest. 6. Complete the table of the electromagnetic spectrum 7. Give two examples where radiowaves are used. Include the wavelength. Communication, elephants 8. Give two examples where microwaves are used. Include the wavelength. Microwaves, phones  9. Give two examples where infrared waves are used. Include the wavelength. Heating lamps, insects 10. Give two examples where visible light waves are used. Include the wavelength. Light/seeing, rainbow 11. Give two examples where ultraviolet waves are used. Include the wavelength. UV light, reptiles 12. Give two examples of where X-rays are used. Include the wavelength. Scanners, X-rays. 13. What is the difference between the different waves in the electromagnetic spectrum? There are different uses for each wave, the lower frequencies are used for communication, the higher frequencies are used for medicinal purposes. 14. What is the law of the reflection of light? Draw a picture to demonstrate this. Angle of incidence = angle of reflection 15. Give two examples of how the reflection of light is used. Mirrors, reduction of heat 16. What effect do concave mirrors have on light? [converge/ diverge] Diverge 17. What effect do convex mirrors have on light? [converge/ diverge] Converge 18. What is the law of the refraction of light? Give the law from dense to light AND light to dense. as light travels from a denser medium to a less dense medium, it bends away from the normal (an imaginary line perpendicular to the surace of the interference between the two media.  19. Give two examples of how the refraction of light is used. Glasses, microscopes 20. What effect does a bi-convex lense have on light? Converge 21. What effect does a bi-concave lense have on light? Diverge 22. Give a definition for the following properties of light and provide and example Property of light Example Diagram/ Image of example Absorption: Absorbs other Paint colours of light except one, which is reflected Transparent: Light passes Cling wrap through the object easily Translucent: Some of the Frosted windows light is passed through Scattering:Light is scattered Sun’s rays passing in all directions through the clouds Opaque: Don’t let light Wood, stone through the object 23. Give a definition for the below. You may use the MY Webpage. https://sites.google.com/dow.catholic.edu.au/smiddleyearslearningsc iencefcc/title-aim-hypothesis?authuser=0 Independent variable: What is changed in the experiment Dependent Variable: What the outcome is because of the change in the independent variable Controlled variable: The objects in an experiment that stay constant Hazard: What does the harm Risk: the harm done to the person Prevention: To remove the possibility of harm beforehand Management: Actions taken after the accident to help improve the safety of everyone (pain/danger). Reliability: Experiment done several times to check if the outcome is the same. Validity: If the controls are the same, and the trials are done in the same manner Accuracy: If the instruments and methods are accurate. 24. List the requirements of a graph. Details, details, details 25. Write the rules for the below. Use your knowledge, notes or research using the MY webpage. Aim: To investigate the (independent variable) and the (dependent variable) Hypothesis: Your prediction Method: Steps to collect data for the experiment, verbs, repeat, devices used, steps to change IV, Conclusion Restate, aim, hypothesis, and results (give data) STUDY NOTES EM Spectrum: - The range of wavelengths or frequencies over which electromagnetic radiation extends. Types and Uses: - Radio waves: Television transmission and radios - Microwaves: Microwaves, weather and wifi - Infrared waves: Tv remote, collect thermal energy and heat lamps - Ultraviolet: Cause sunburns, uv lights in hospitals and sterilize medical equipment - X-rays: Take images of bones, mammograms and checking for pneumonia - Gamma rays: Kill cancer cells and radioactive tracers Reflection: throwing back from a boundary the wave encounters without absorbing it e.g. Rear view mirror of cars, telescopes Refraction: Change light undergoes when it enters a different medium e.g. telescopes and form rainbows Longitudinal: Transverse Waves: