The radius of a typical nucleus is about 5.0 × 10-15 m. Assuming this to be the uncertainty in the position of a proton in the nucleus, estimate the uncertainty in the proton's energy (in eV)
What will be an ideal response?
8.2 × 105 eV
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According to general relativity, a black hole is
A) an object that cannot be seen. B) a hole in the observable universe. C) a place where light travels slower than the normal speed of light. D) a place where light travels faster than the normal speed of light. E) a place where there is no gravity.
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 ?T, no matter how large or how small ?T 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.
Compared to the density of water, our Earth averages about:
A) the same density, similar to Saturn. B) 3 times denser, much like our Moon. C) 4 times denser, similar to Mars. D) 5 times denser, like the Mercury and Venus. E) 10 times denser, due to our core of iron and nickel.
In a heat pump,
a. heat is used to do work. b. heat flows spontaneously. c. the same process is used as in a heat engine. d. work is used to transfer heat.