The energy of a photon equals ______________ multiplied by the frequency
Fill in the blank(s) with correct word
h, or Planck's constant
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The energy of a proton is 1.0 MeV below the top of a 6.8-fm-wide energy barrier
What is the probability that the proton will tunnel through the barrier? (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 0.051 B) 0.048 C) 0.056 D) 0.053
The noble gases, listed by increasing molecular weight, are He, Ne, Ar, Kr, Xe, and Rn. If samples of 1 mole each of these gases are placed in separate containers and heated to 300 K, which gas has the greatest internal energy and the molecules of which gas have the highest rms speed?
a. The He has the greatest internal energy, and the Rn has the greatest rms speed. b. The Rn has the greatest internal energy, and the He has the greatest rms speed. c. All the gases have the same internal energy, and the Rn has the greatest rms speed. d. All the gases have the same internal energy, and the He has the greatest rms speed.
Why is a global magnetic field thought to be necessary for life to exist on the surface of a planet?
A) A magnetic field shields the planet from harmful ultraviolet light. B) A magnetic field helps form ozone in the upper atmosphere. C) A magnetic field helps keep the planet's atmosphere from being stripped away by stellar winds. D) A magnetic field helps warm the planet's surface through the greenhouse effect.
Suppose you find a rock and measure that 12.5% of the original uranium-235 still remains it, while the other 87.5% has decayed into lead-207. About how old is the rock?
a. 4.5 billion years b. 1.25 billion years c. 2.8 billion years d. 2.1 billion years