What absorbs sound the best? In general, soft, pliable, or porous materials (like cloths) serve as good acoustic insulators – absorbing most sound, whereas dense, hard, impenetrable materials (such as metals) reflect most. How do I block traffic noise in my bedroom? Hang heavy curtains or drapes on windows (you could even try hanging heavy […]
How do maglev trains start moving?
How do maglev trains start moving? Maglev trains work on the principle of magnetic repulsion between the cars and the track. To begin motion, the train moves forward slowly on these wheels, allowing the magnets beneath the train to interact with those of the guideway. How does maglev trains run without wheels? This junkyard crane […]
Why do elements have different line spectra?
Why do elements have different line spectra? The energy levels that are allowed for each atom depend upon the number and arrangement of protons and electrons in the atom. As each element has different energy states available to it, each element releases photons of different color when its atoms return to their lower energy states. […]
What Crystal shape is best?
What Crystal shape is best? Learn what 7 common crystal shapes mean—and how to best use them. Cubes. If you need some grounding vibes in your life (don’t we all?), a cube-shaped crystal might be the perfect gemstone companion for you. Pyramids. Spheres. Tumbled stones. Crystal points. Hearts. Clusters. What are the basic types of […]
How long will it take until only 25 percent of the strontium 90 remains?
How long will it take until only 25 percent of the strontium 90 remains? It takes 28.8 years for half of the strontium to decay to 50 grams. This is called one half-life. After 28.8 more years, strontium-90 has decayed to 25 grams. How does half-life work? A medication’s biological half-life refers simply to how […]
How can I reduce radiation in my home?
How can I reduce radiation in my home? These approaches involve reducing both the exposure level and duration. Disable Wireless Functions. Wireless devices — including routers, printers, tablets, and laptops — all emit a Wi-Fi signal. Replace Wireless With Wired Devices. Keep EMF Sources at a Distance. Use Your Smartphone Safely. Prioritize Sleeping Areas. What […]
What is the internal resistance of a 12v battery?
What is the internal resistance of a 12v battery? 500 ohms What would be the symptoms of a battery with high internal resistance? High resistance, current is restricted, voltage drops on load; battery heats up. Figure 1: Effects of internal battery resistance. A battery with low internal resistance delivers high current on demand. High resistance […]
Will a high pH kill fish?
Will a high pH kill fish? Very high (greater than 9.5) or very low (less than 4.5) pH values are unsuitable for most aquatic organisms. Young fish and immature stages of aquatic insects are extremely sensitive to pH levels below 5 and may die at these low pH values. High pH levels (9-14) can harm […]
Which converging lens has the greatest power?
Which converging lens has the greatest power? The convex lens of smaller focal length (= 20 cm) has greater power since focal length is reciprocal of power. Has more focal length then its power will be? Answer. Answer: Thick lens will have shorter and consequently thin lens will have greater focal length. Because, For a […]
What is an example of a fusion reaction?
What is an example of a fusion reaction? Nuclear fusion is a process in which atomic nuclei are fused together to form heavier nuclei. Like fission, nuclear fusion can also transmute one element into another. For example, hydrogen nuclei fuse in stars to form the element helium. Is nucleosynthesis a fusion? Stars fuse light elements […]