a1. George b2. Bogdan c3. Michael ph5 d4. Sergey B. e5. Martha f6. Bogdanka g7. Sofia V. h8. Olesya

Photometry - a section of optics, which studies the light flow of light sources (their radiation properties and measurement) and the light source and the perception of the radiated energy devices and the human eye.
The light source shall assume bodies that emit electromagnetic waves in the optical range (visible, infrared and ultraviolet rays). Moon is not the true source of light, because the glow caused by the reflection of solar radiation.
4. waves emitted by the form of:
The relationship between (lm) and (W) is defined as: transducer perfectly efficient electricity power 1W light creates wavelength 550 nm (green light) ph5 light output, which is perceived by our eyes and is rated at 650 lumens.
A light meters (lyuksometry). It is this value determined by the rules of illumination, in which the use of the eye is the most secure (for example, recommended lighting of premises 80 lux).
1 Kd equal to the force of a special light bulb, which emits a certain direction by passing it through strictly ph5 specified amperage. This unit is one of the seven basic units SI.
Tags: photometry
Freefall
On Education ... - * 15 points that underlie the motivation of students ph5 at Harvard University. * * 1. If you fall asleep now, you, of course, ...
a1. George b2. Bogdan c3. Michael ph5 d4. Sergey B. e5. Martha f6. Bogdanka g7. Sofia V. h8. Olesya i9. Lev j10. Sofia I. l12. Roman m13. Sofia K. n14. Olya o15. Vovchyk p16. Vladislav q17. Nestor s19. Nazar t20. Sergey ph5 P. u21. Taras Yuri-v22. Adrian y25. Anastasia z26. Ilya za27. Nasty zb28. Taras zc29. Nadia zd30. Acne ze31. Games zz32 Olga
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