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### 19 Cards in this Set

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 What happens to a ray of light when it goes from air to a more dense medium? It's speed and wavelength change Frequency does not change in a new medium Which type of electromagnetic wave is more readily absorbed: long wavelengths or short wavelengths? Would IR be absorbed at more than visible light? Shorter wavelengths are more readily absorbed (hence an xray has high frequency and is absorbed by bone) IR has a longer wavelength than visible light, so visible light is absorbed more. If a sound is reduced by an intensity of 20dB's, what factor of intensity does it decrease by? intensity For a block on an incline plane, what is the force parallel to the incline (pulling the block down F = mg sin (θ) If a block on an incline plane at angle θ is not moving, what is the μs (static coff)? μs ≥ tan θ What is constant while in uniform circular motion: Speed? Velocity? Speed is constant Velocity is changing direction, hence no constant Give eqn for centripetal acceleration centripetal acceleration Define centripetal force Sum of Ft in string and gravity, not a new force Give eqn for rotational momentum rotational momentum Give eqn for torque relating it to rotational acceleration rotational acceleration What is impulse (J)? Change in momentum What are the 3 different types of heat transfer? Conduction: vibration of atoms transfered to neighbors Convection: heat transfers to air, air becomes less dense, carries heat upwards Radiation: sun rays travel across empty space to heat earth What is the density of water? 1g/cm^3 How does each density react to changes in temp and pressure? Give 2 eqns pertanint Solids and liquids don't change much, thus their specific gravity doesn't change much Gases however follow the eqns above Give eqn for flow rate (Q) Flow rate Describe the force that drives capillary action up a tube? Give eqn of the force Surface tension. Force that resists changes surface distortion Can a magnetic field do work? Can it change speed and direction? No, it is always perpendicular to v It can change speed and direction What is the 1st harmonic of a wave with wavelength X in a closed tube? 1/2 wavelength. What is the definition of n (like in Snell's Law) in optics? n = c / v speed its the speed of light / v of light in medium