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What is the Wavelength of a red laser pointer?
Typically, most pocket red laser pointers have wavelengths that range between 630nm and 680nm. A helium neon red laser pointer has a wavelength of 633nm.
A laser beam of wavelength 630nm is directed normally at a diffraction grating with 300 lines per millimetre. Calculate the angle of diffraction of each of the first two orders.?
1/(3*10^5) = 0.000003(recurring) (630*10^-9)/0.000003(recurring) =0.189 sin^-1(0.189)=10.9 degrees (first order) 10.9*2=21.8 degrees (second order)
What wavelength of light is most effective in driving photosynthesis?
The wavelength most effective in conducting photosynthesis is 420nm. ^^ Actually, 420nm is on the blue side of the spectrum, which makes up between 1 and 10% of the light needed for photosythesis. There is a plateau on the blue side when comparing blue wavelength effects on photosynthesis, and 420nm is right on the edge of it. 430nm would be more in the middle of the plateau, making it the safer bet. Plants need red light, and lots of it. Red light contributes to over 90% of photosynthesis. You can't grow plants on just blue light. Seems to be the most efficient wavelength of red light, for photosynthesis, is between 660nm and 680nm, and not higher. Unlike blue, there is no plateau when comparing red wavelength effects on photosynthesis, so there is a more broad answer, depending on the plant. It seems though, if working with LEDs, that 630nm are more mass produced (cheaper). So you can just use those instead, or couple them with far red light (infrared), 730nm, to stimulate PFR, germination. Far red light depends greatly on what you are growing though, read up on it. I'm no expert, but the first answer wasn't very good. ^^ Overall, I would agree with this answer. However, it is possible to grow a plant using only blue light. Blue light is required for the vegetative growth of plants. I have been able to grow basil using blue LED lighting on a 20 hour cycle. This is fine for herbs. If you wish for your plant to flower you will need red light at the wavelength described in the previous answer. It is also possible to grow plants using only a red wavelength. Although, from what I hear the plants will look a little thinner than normal but the quality of tast should be the same.
How many feet are 630NM?
Are we talking nanometres? 1 nanometre is one BILLIONTH of a metre. Engineers choose a scale of measure that is proportionate to what they are measuring. Nanometres on a subatomic scale, light years on a cosmic scale. Certainly you can convert one to the other but it is of little use. To convert nm to feet. Feet to metre multiply by 0.3048. A nanometre is one billionth of that. One billion in numbers is 1,000,000,000.
How fast is a ML63 AMG?
Most AMG-tuned Mercedes are limited electronically to 155mph. MB ML63 AMG Engine: V8 | 4-Valves | 6.2L | 6208cc | 379Ci 510hp @ 6800RPM | 465lb-ft @ 5200RPM | 630Nm @ 5200RPM | 375kW Transmission: 7-Speed Automatic | AWD(4MATIC) Weight: 2,235Kg (4,917lbs) Tires/Wheels: F: 295/35/21 R: 295/35/21 Performance: 0 - 100km/h: 5.4s Top Speed: 250km/h (156mph)
Why you can not see the colours of light with your naked eyes?
Visible light is defined from wavelengths around 380nm to 780nm. Wavelengths smaller than 380nm are called ultraviolet and wavelengths larger than 780nm are called infrared. Based on those two names, you can probably guess how the visible spectrum is broken up. Specifically (in nanometers): Violet is 380-45 Blue is 450-495 green is 495-570 yellow is 570-590 orange is 590-620 red is 620-780 What is special about these wavelengths is that our eyes are optimized for them. We have what are called cones and rods inside our eyes (about 6 to 7 million cones and 75 to 100 million rods in each eye). These cones and rods are mini sensors, taking in the photons. Depending on the photon, they will affect different cones and different rods. The cones can be broken up further into blue, green and red. The cones are responsible for everything we see as color. The blue cones pick up wavelengths from 380-500, but they are most sensitive around 430nm. The green cones are even more sensitive than blue ones; they pick up wavelengths from 450 to 630nm. This cone is most sensitive around 540nm. The final cone, the red cone, goes from 500nm to 700nm, peaking at around 580nm. This may seem like a lot of data, but what it is telling us is that we don't have any cones for wavelengths outside of these ranges. So we defined the the wavelengths of the EM spectrum as visible light only because we can see those wavelengths. Birds on the other hand, have four cones, the fourth being optimized for ultraviolet light. This kind of brings into question, what does blue/green/red even mean? That is a difficult question to answer because there is no inherent 'blueness' to light, its just how our brain interprets the signals for blue/green/red. We wouldn't know how to describe what birds see at all, because what they see has never been seen by people before. That isn't to say we cant utilize the other spectrums. We use x-rays and infrared light all the time. What happens though, say in infrared goggles, is that we make sensors that CAN see those wavelengths, and then we manipulate that incoming wavelength into a wavelength that we can see. So if you have ever seen night vision before, its not that the night looks green, its just a conventional way to show you what you cant possibly see.
