# Physics Question (true or false)

Jun 17th, 2015
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1. A mole of helium gas has exactly the same number of atoms as a mole of lead. True 2. Two 90-decibel sound sources are turned on at the same time. Together they create a 180-decibel sound level. False. The sum of the two sounds will be 93 decibels. The decibel is based on the base-ten logarithm of the sound pressure level.

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From Wikipedia, the free encyclopediaNewton's Rings observed through a microscope. The smallest increments on the superimposed scale are 100m.The experimental setup: a convex lens is placed on top of a flat surface.The phenomenon of Newton's rings, named after Isaac Newton who first studied them in 1717, is an interference pattern caused by the reflection of light between two surfaces - a spherical surface and an adjacent flat surface. When viewed with monochromatic light it appears as a series of concentric, alternating bright and dark rings centered at the point of contact between the two surfaces. When viewed with white light, it forms a concentric ring pattern of rainbow colors because the different wavelengths of light interfere at different thicknesses of the air layer between the surfaces. The light rings are caused by constructive interference between the light rays reflected from both surfaces, while the dark rings are caused by destructive interference. Also, the outer rings are spaced more closely than the inner ones. Moving outwards from one dark ring to the next, for example, increases the path difference by the same amount , corresponding to the same increase of thickness of the air layer /2. Since the slope of the convex lens surface increases outwards, separation of the rings gets smaller for the outer rings. For surfaces which are not convex, the fringes will not be rings but will have other shapes.The radius of the Nth Newton's bright ring i

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