Where the Light Goes When I Switch Off the Lamp?

Light dose not go anywhere. Light is made up of photons. so when we switch on the lamp the electric current ionizes the gas inside it and which in turn emits photons which we normally called light. Now when we switch off the lamp the current goes off, the gas gets dis-ionized and it stops emitting photons. So we cannot see anything

1. I want to create a club in my city with great sound? How much would I need to spend on a great sound system and good lights? Funktion 1 or Void? Lighting system?

It's important to have good sound from the beginning. however, lots of people forget to treat the room for it. I have seen clubs, rocking out of Adam Audio 10. 000 speakers per monitor, and the acoustics being perfect. those are wonderful clubs for SPECIFIC genres. If you just want a big and cheap mainstream club, mediocre Equipment and less room treatment will probably do. Your club is only as good, as it's entertainment value is. Light seems to be obvious choice here, very few clubs understand how important sound/room treatment is for "translating the music" well to the audience

2. Five Types of Ambient Light You Should Know How to Use in Photography

As photographers, we have but one raw material to work with: light. You will hear this time and time again, you need to learn to see that light and learn how your camera sees it. Knowing what to look for is just the beginning. Figuring out how to use light, or more importantly how you will use it, is the larger part of your photographic journey. Today, I would like to run you through five types of light I love and use often. Backlight is a favorite of many photographers. It allows us to create various moods depending on atmospheric conditions and choice of exposure and framing. The only thing that all forms of backlight share, as the name suggests, is that the light source is behind the subject. Shooting this type of light presents its own set of challenges and each lens and camera will react differently. Here are a few things you can try. Maybe one of the easiest ways to use backlight is to create silhouettes. With a strong backlight, this is easy. Simply place your subject between yourself and the light then expose for the background. If the light behind your subject is strong and there is no other illumination on it, you will end up with a black silhouette. One of your main concerns when photographing a silhouette is overlap. You want to be sure that your subject does not overlap with anything that might detract from its shape. This may cause the subject not to read well. Compose so that the sun is just outside of your frame and expose for your subject. Try shooting this shot with a 50mm or 85mm prime and a wide open aperture like f/1.4 or f/1.8. You will achieve a softer look than normal due to the light flaring into the lens and reducing contrast. Different lenses will react differently to this type of composition, so experiment with each of your lenses. Next, place the sun in your frame, allowing it to just peak out from behind another object. Stop your lens down significantly, to something like f/11 or f/16. This will create a star shape from the light of the sun and usually a lot of flare artifacts. Again, lenses all react differently to this. Try a wide angle lens like a 24mm and see what happens. Finally, you can use this technique to play with atmospheric conditions like smoke, clouds, or dust. These things become illuminated when they are back lit and start to glow. This can create a lot of mood in your images and is one of my favorite ways to use back light. The warm glow of sunset lighting up the dust and smoke on the plains of Bagan in Myanmar is one famous example of this that attracts photographers from all over the world. This one may not be useful for all subjects all the time, but it can create very dramatic scenes. A harsh beam of light coming from directly above your subject can make for an air of mystery or darkness that a more flattering light will not. I find it very useful when I am aiming to create a deeper, darker mood than my usual work. You can find this light when the sun is directly above (think alleyways with a slash of sun coming in) or when only ceiling lights are present (as with my image in the Seoul metro system below). Window light is another love of many photographers. It can be wonderful when photographing portraits, food, still life, or just about anything really. The soft yet directional quality of window light means that it crafts a very three-dimensional look right from the get-go. A window around eye-height for a portrait can produce a beautifully flattering portrait reminiscent of old paintings or illuminate food for a scrumptious looking dish with vibrant colors. The key when using this type of light is to expose for the highlights of what you are shooting to maintain the depth of the light. If you find your shadows going too dark, simply add in a reflector for fill opposite the window. This is one of my favorites. Once learned, this type of light becomes such an asset when out on location. The shade just inside a door, or under an awning can be beautiful at any time of day. However, it is extremely useful in the middle of the day when the sun is high. It gives you a gorgeous soft light that can be used in many different ways. The main reason I separate this from window light is that lighting coming inside a door tends to bounce off the ground as well with nothing to block it. This fills in shadows from the bottom as well, creating a glowing quality. This is something that took me some time to come to grips with and a little encouragement from my friend Fer Juaristi to get me actually using it. Light coming from an angle without any diffusion can produce beautifully defined shadows and only illuminate patches of a scene if you compose carefully. Exposing for the highlights and not letting anything blow out can lead to dramatic yet aesthetically pleasing results. By allowing the shadows cast to be a part of your scene, you can also include additional points of interest. Take the image below, for example. Early morning sun resulted in lovely shadows of the passers-by on this wall in Hoi An, Vietnam. I got my exposure just where I wanted it and then waited for the right character to enter my scene. The nearby trees were also used for additional visual interest. For us here in Seoul, this is a rare light to see, but for those of you in regions with clear air and lots of clouds, keep an eye out for this one. When you have a sky covered in dramatic clouds, keep an eye out for breaks in those that will allow sunset light to softly illuminate your subject. Walk around this light; shoot it from many angles. How does it illuminate your foreground? What happens to the parts of the image the warm glow does not hit? Do you prefer it when this light is strong and bright, or when it too is filtered by a light layer of clouds? These are just a few types of light that I love and use. Of course, you can also use flash or reflectors to augment your light. However, these basics are useful to experiment with and learn to use. What is your favorite type of light? How do you use it?

3. If I make a phone call as I travel away from Earth, increasing speed until I reach light speed, what would the call sound like?

A2A: Initially, as you go faster and faster and get further away, the light (or radio) transmission frequency from you to them will get red shifted in a way predicted by the frequency shift of light given by special relativity, as will their reply to you. See Relativistic Doppler Effect for details. Assuming this is an analogue phone system and your voice is frequency modulated on top of the signal, on direct conversion back to sound, your voice will progressively get lower in pitch and slower at the same rate, as will their reply. Speed up the tape replay, and it will all sound normal. If digital transmission, how you encode and decode the voice is entirely up to you. With modern standards, all would sound normal (just with progressively increasing lag between questions and answers due to the decreasing maximum bit rate of reception. )If you used a fixed length "land line" using optic cable you had spooled out light years in front and back and then drag one end along with you on your journey, the transmission/reception light would still be red shifted and lagged due to relativistic effects, but the reception lag due to distance would be further delayed by the non-direct path of the light along the fibre, and by the lower speed of light in the fibre.Which actually raises an interesting point. What happens when your velocity has not yet reached "c" in vacuum (impossible), relative to home, but has exceeded the nominal transmission speed of light in the fibre. I might leave that answer to others! (I suspect the photons are absorbed in the fibre media never to arrive)These relativistic rules are not that hard to learn. Once you derive the results yourself for the experiments that have been used to prove them, you start to get a more intuitive feeling about what is going on. Calculating outcomes in these situations is not any more than basic algebra. We talked further about your experiment at the last meeting of the Quora United Physicists Union. Unfortunately the ethics sub-committee has denied your request to conclude your experiment with the attempt to travel at the speed of light as being too dangerous to the on-going existence of the universe.But there is good news. We have passed round the hat and begun collecting funds to send you at highest practical speed to the nearest black hole, voted unanimously at the Union Christmas Party as "the next best thing if your local by-laws forbid light speed" Further good news, resolution 6b of the ethics sub-committee specifically allows you to attempt your light speed record for matter free of cost, surcharges and state taxes, at any time of your choosing after you pass the event horizon. When we receive your phone call following this attempt, and regardless if you achieved light speed or not, we will purchase your communication technology (no signal limit module included) by transferring any amount of your choosing to any bank account of your choice. Have a nice trip! Local guides advise us that your phone might get quite dirty from all its use in these experiments of yours and recommend finding a telephone sanitiser technician well before you get to the planet Golgafrincham as there are on-going labour disputes in this region