1. Waves (2)
S3 Physics - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

2. 1. What is the speed of light
answer
300,000,000 ms-1

3. 2. What is the law of reflection?
answer
“The angle of incidence = the angle of reflection”

4. 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

5. 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

6. 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.

7. 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

8. 7. What type of lens brings parallel rays of light to a a focus point?
answer
A convex or converging lens

9. 8. What does a prism do to a ray of white light?
answer
Splits it into a visible spectrum.

10. 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

11. 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

12. 11. Name a detector used to detect Infrared radiation.
answer
Thermal imaging sensor or photodiode
or skin.

13. 12. Which section of the EM spectrum has the highest energy ?
answer
Gamma rays

14. 13. Are light waves transverse or longitudinal?
answer
Transverse

15. 14. What kind of light is used to send information through a fibre optic cable ?
answer
Laser light

16. 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.

17. 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 MHz ?
answer
wavelength = v/f = 300,000,000 / 102,500,000
= 2.93m