Waves (2) S3 Physics - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1. What is the speed of light answer 300,000,000 ms-1
2. What is the law of reflection? answer “The angle of incidence = the angle of reflection”
A dotted line drawn at right angles to a surface 3. What is a “normal” line A dotted line drawn at right angles to a surface answer
4. What is meant by the term refraction Refraction is when light slows down as it passes from air into glass. This can cause it to change direction. answer
It slows down and bends towards the normal. 5. What happens if light passes from air into glass at an angle to the normal? answer It slows down and bends towards the normal.
6. What is meant by the term “critical angle” answer The angle above which light in glass is not refracted out but is totally internally reflected
7. What type of lens brings parallel rays of light to a a focus point? answer A convex or converging lens
8. What does a prism do to a ray of white light? answer Splits it into a visible spectrum.
The Electromagnetic Spectrum 9.What is the name of the family of waves that all travel at the speed of light? answer The Electromagnetic Spectrum
What is the order of the sections in the EM spectrum starting with the lowest frequency? answer Radio &TV, microwaves, Infrared, Visible, Ultra Violet, X-Rays, Gamma Rays
11. Name a detector used to detect Infrared radiation. answer Thermal imaging sensor or photodiode or skin.
12. Which section of the EM spectrum has the highest energy ? answer Gamma rays
13. Are light waves transverse or longitudinal? answer Transverse
14. What kind of light is used to send information through a fibre optic cable ? answer Laser light
A concave or diverging lens. 15. What type of lens would correct the vision of a short sighted person answer A concave or diverging lens.
16. What is the wavelength of a radio wave that has a frequency of 102 16. What is the wavelength of a radio wave that has a frequency of 102.5 MHz ? answer wavelength = v/f = 300,000,000 / 102,500,000 = 2.93m