Light waves reflected off a body of water are strongly polarized in the horizontal direction. To reduce glare polarized sunglasses are made
A. with the transmission axis horizontal.
B. with the transmission axis vertical.
C. with the transmission axis at 37°.
D. Polarized sunglasses don’t help with glare
B. with the transmission axis vertical.
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A 360-g metal container, insulated on the outside, holds 180.0 g of water in thermal equilibrium at 22.0°C. A 24.0-g ice cube, at the melting point, is dropped into the water,
and when thermal equilibrium is reached the temperature is 15.0°C. Assume there is no thermal energy exchange with the surroundings. For water, the specific heat is 4190 J/kg ? K and the heat of fusion is 3.34 × 105 J/kg. What is the specific heat of the metal of the container? A) 1700 J/kg ? K B) 970 J/kg ? K C) 2300 J/kg ? K D) 2800 J/kg ? K E) 3300 J/kg ? K
Energy Levels: The shortest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 12, is closest to which one of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 92 nm B. 82 nm C. 72 nm D. 62 nm E. 52 nm
What do we mean by the interstellar medium?
A) the gas and dust that lies in between the stars in the Milky Way galaxy B) the dust that fills the halo of the Milky Way galaxy C) the middle section of the Milky Way galaxy D) the name of an oracle who can channel messages from beings that live near the star called Vega
Complete the following sentences that describe evidence found in the K-T boundary layer. Drag words at the left to the correct blanks in the sentences at the right.
A. The presence of soot suggests that there were world-wide forest fires at the time this layer formed. B. The presence of solidfied rock "droplets" is thought to indicate that rock splashed upward by an impact was molten as it fell back down from the sky. C. The presence of shocked quartz suggests an impact because these mineral grains form only under high-pressure conditions. D. The unusually high abundance of iridium in this layer suggests that this material came from the impact of an asteroid (or comet). E. All of the above.