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Use dimmer switches on household lights or use candles. At night, use dimmer switches in your home to reduce unnecessary lighting, or try using candles if you want to reduce your light pollution even further, and to encourage your own body’s winding down for the night. You might find that you like the effects, and appreciate the increased restful sleep of your entire family! Also, if possible, consider eliminating your use of electronics a couple of hours before you go to bed to eliminate the blue light that such devices often emanate that may negatively impact your body’s own melatonin production. Click a vehicle warning light to see more detailed information. According study conducted by CarMD, five common malfunctions cause the check engine light to come on, and several of them are simple to fix yourself. Let’s take a look at the most common issues. Like light waves, water waves emerging from two sources interferes in the space surrounding the sources to produce a pattern of nodes and antinodes lying along lines. The diagram at the right represents the interference pattern created by two water waves. The waves were created by two objects bobbing up and down in phase at the same frequency. Point P on the pattern is a distance of 34.0 cm from S1 and 23.8 cm from S2. Determine the wavelength (in cm) of the water waves. While light of any kind can suppress the secretion of melatonin, blue light at night does so more powerfully. Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light to exposure to green light of comparable brightness. The blue light suppressed melatonin for about twice as long as the green light and shifted circadian rhythms by twice as much (3 hours vs. 1.5 hours). The furthest objects visible, quasars, have been detected 13 billion light years away.[1] After allowing for the metric expansion of space,[2] this puts the lower limit of the age of the universe at near 13 billion years.[3] The methods of measuring distances to the billions of light years are rather complicated, but there are direct measurements well beyond the limits of YEC, using only parallax. There are the measurements of the supernova SN1987A at about 168,000 light years, and the Gaia space mission should obtain many distances of objects up to about 30,000 light years.[4] In a museum exhibit, monochromatic red light (λ = 648 nm) passes through a double slit and is projected onto a screen located 16.8 m from the slits. A metric ruler located above the interference pattern clearly shows the fifth dark fringe to be located 42.0 cm from the central bright spot. Determine the slit separation distance. In North America the situation is comparable. There is a significant problem with light pollution ranging from the Canadian Maritime Provinces to the American Southwest.[28] The International Dark-Sky Association works to designate areas that have high quality night skies. These areas are supported by communities and organizations that are dedicated to reducing light pollution (e.g.Dark-sky preserve). The National Park Service Natural Sounds and Night Skies Division has measured night sky quality in national park units across the U.S. Sky quality in the U.S. ranges from pristine (Capitol Reef National Park and Big Bend National Park) to severely degraded (Santa Monica Mountains National Recreation Area and Biscayne National Park).[29] The National Park Service Night Sky Program monitoring database is available online (2015).[30] Don’t Ignore That Light So if the Check Engine light comes on and it’s steady rather than flashing, what do you do? The most obvious answer, of course, is to get the engine checked. But many people do nothing, perhaps fearing an expensive repair bill. Some drivers with older cars want to squeeze out as many remaining miles as possible without visiting a service garage. But before they can pass their state’s vehicle inspection, they have to get the light turned off. And a state inspection is a good motivator for dealing with the problem. If the light is lit, there’s a good chance the car is releasing excess pollutants or consuming too much gas. In light of the “March For Our Lives” happening in Washington D.C. today (as well in venues across the nation and the globe), I want to address the logic of the argument I have seen most often in the wake of the Stoneman Douglas High shooting—an argument against imposing stricter gun regulations, such as universal background checks and banning assault rifles. The argument goes like this: In North America the situation is comparable. There is a significant problem with light pollution ranging from the Canadian Maritime Provinces to the American Southwest.[28] The International Dark-Sky Association works to designate areas that have high quality night skies. These areas are supported by communities and organizations that are dedicated to reducing light pollution (e.g.Dark-sky preserve). The National Park Service Natural Sounds and Night Skies Division has measured night sky quality in national park units across the U.S. Sky quality in the U.S. ranges from pristine (Capitol Reef National Park and Big Bend National Park) to severely degraded (Santa Monica Mountains National Recreation Area and Biscayne National Park).[29] The National Park Service Night Sky Program monitoring database is available online (2015).[30] A typical kerosene lamp is made by taking an empty bottle or tin can, putting a wick in the middle, filling it with fuel and lighting. Using kerosene for lighting is extremely inefficient, dangerous and expensive, and it has extensive health and environmental drawbacks. All of this can be traced to one thing: the curse of light pollution.  I just dropped my camera and now the red light isn’t going away please help me The Check Engine light — more formally known as the Malfunction Indicator Lamp (MIL) — is a signal from the car’s engine computer that something is wrong. The car dealer’s service department can diagnose the problem for about $75. But there’s a way to preview what the problem might be. Lastly, you can do your part by learning more about light pollution and by taking steps to reduce extra nighttime lighting in your own town and backyard. In addition to letting you see the stars better, these steps may also save you money on electricity and help reduce the world’s energy usage. Cities and towns that routinely put up ever-brighter lights for no reason other than “that’s what we’ve always done” may think twice about spending the money if they hear just a few voices of opposition. Jackson and Melanie are doing the Young’s Experiment Lab using a red laser pen and a slide with two slits spaced 25 micrometers apart. They project the interference pattern onto a whiteboard located 2.35 m from the slits. They measure the distance from the 3rd bright band on opposite sides of the pattern to be separated by 37 cm. Based on these measurements, what is the wavelength of the red laser light (in nanometers)? (GIVEN: 1 m = 106 mm, 1 m = 109 nm) For a long time, solution two was very popular, and while it is less popular today, it continues to have a wide following (the late Henry M. Morris, Jr. was fond of this solution). Proponents argue that by its very nature, creation must include some “appearance of age,” for plants, animals, and people were not made as embryos or infants, but as mature adults, even though they did not go through the normal process of growth to reach adulthood. We certainly see this is true of Adam and Eve, but it also would seem to be true of plants, or else they could not fulfill their God ordained purpose of providing food only 2–3 days after they appeared if they were not mature (Genesis 1:29–30). Similar reasoning applies to many animals. Thus, the stars could not fulfill their purposes unless they were visible right away, so God made them with their light already en route to earth. This has a certain amount of appeal to it, but it also could be construed as deceptive on the part of God to make light containing tremendous amount of information of physical processes that never happened. Since the vast majority of the universe is more than a few thousand light years distant, it would seem that we will never see light that actually left these distant objects, and hence much of the universe amounts to an illusion. This concern has been the primary motivation of those seeking other solutions to the light travel time problem. 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