The temperature of melting ice is
A) 0°C.
B) 32°F.
C) both of these
Answer: C
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Uncertainty Principle Using Momentum and Position: If an electron is determined to be at x = 2.000 cm ± 0.0010 cm, what is the minimum uncertainty in the x component of its velocity? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
A source emits sound at a fixed constant frequency f.If the source moves away from you faster than the speed of sound in air, the frequency that you hear is
a. the same as f. b. higher than f. c. lower than f. d. unrelated to f.
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every DT, no matter how large or how small DT is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature. b. Neither, because a change of state may involve release or absorption of latent heat. c. Neither because a substance may do work during a temperature change. d. All of the statements above are correct. e. Only statements (a) and (b) are correct.
The look-back time is numerically equal to the distance to a galaxy in light-years
a. True b. False Indicate whether the statement is true or false