Far-ultraviolet rays have short wavelengths, low energies, and travel at the speed of sound
a. True
b. False
Indicate whether the statement is true or false
False
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Conduction: In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section with dimensions 8.00 cm × 8.00 cm. After 5.00 min of running the experiment, 64.0 g of ice have melted. What is the thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg, the latent heat of vaporization of water is 2.256 × 106 J/kg, and both the ice and water are under 1.00 atm of pressure.
A. 0.130 W/m ? K B. 0.250 W/m ? K C. 0.440 W/m ? K D. 0.620 W/m ? K E. 1.12 W/m ? K
The fact that a particle cannot be precisely localized is the
a. photoelectric effect. b. uncertainty principle. c. principle of a hologram. d. principle of a laser. e. reason why photons are emitted.
Mass can be considered concentrated at the center of mass for rotational motion
Indicate whether the statement is true or false
We say we are looking back in time when we are looking at the stars because
A) we see stars as they once were when their light reaches us. B) space curves, we are actually looking at the past when we look in the night sky. C) stars are emitting immense radiation, we are seeing processes that have already happened. D) Earth's atmosphere bends and distorts their light.