1. Properties of light – A tool in Energy and Environmental Physics F. Sigernes A trial lecture @ NTNU

2. A-M Ampère 1775-1836 C. F. Gauss 1777-1855 M. Faraday 1791-1867 J. C. Maxwell 1831-1879 OERSTED, H. C. 1777-1851 H. R. Hertz 1857 - 1894 M. Planck 1858 - 1947 A.Einstein 1879 - 1955 N. Bohr, 1885-1962 Images are taken from search engine Google Images

4. A plane polarized sinusoidal wave!

7. color (Å) f (*10 14 Hz)Energy (*10 -19 J) violet4000 - 46007.5 - 6.55.0 - 4.3 indigo4600 - 47506.5 - 6.34.3 - 4.2 blue4750 - 49006.3 - 6.14.2 - 4.1 green4900 - 56506.1 - 5.34.1 - 3.5 yellow5650 - 57505.3 - 5.23.5 - 3.4 orange5750 - 60005.2 - 5.03.4 - 3.3 red6000 - 80005.0 - 3.73.3 - 2.5 VISIBLE LIGHT

8. DISRETE SPECTRA – ABSORPTION AND EMISSION

9. Intensity = Lifetime x # atoms energized Nordkvist (2006)

10. CONTINOUS SPECTRA

11. BASIC PROPERTIES OF LIGHT 1)Light is electromagnetic waves – radiation 2)It travels through empty space 3)The speed is constant as a function of wavelength 4)It is polarized depending on direction or rotation of E 5)Light are emitted or absorbed in discrete chunks of energy 6)These packets of energy – photons - have energy E=hv 7)Photons are released as a response to jumps in atomic / molecular energy levels (from Bohr’s model of the atom) 8) Light is both a particle (photon) and a wave – depends how we observe it. 9) Intensity is directly related to number of photons emitted from an object. 10) Objects emits light in form of continuous or discrete spectra – depending mainly on density and temperature. 11) Light has wavelike behavior: it reflects, refracts, diffracts and interfere...

12. “Spectroscopy – is the tool to study the properties of objects.” Basics of a hyperspectral imager – a camera that that images as a function of wavelength!

13. Basics of an airborne hyperspectral imager- bush broom (Zsolt, 2006)

14. VEGETATION – ROCKS - SEA & FRESH WATER

15. VEGETATION UNDER WATER

16. SCRIMPS: SKALL, SKALL IKKE!

17. REFERENCES Douglas C. Giancoli, Physics for Scientists and Engineers, 2. ed., Prentice Hall, Englewood Cliffs, New Jersey 07632, US, ISBN 0-13-669201-X, US, 1988. Astronomy Notes (2004 Edition) by Nick Strobel, ISBN 0073122491, http://www.astronomynotes.com/http://www.astronomynotes.com/ *Sample data are from experiments at Fiskeriforskning in Tromsø and from airborne campaigns at UNIS.