In radioactive decay, when the parent material decays to one-quarter of its original amount, the time is
A) one half-life.
B) two half-lives.
C) three half-lives.
D) four half-lives.
Answer: B
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The proton-proton chain requires a temperature of 100 million K to get started
Indicate whether the statement is true or false
A Carnot cycle engine operates between a low temperature reservoir at 20°C and a high temperature reservoir at 800°C
If the engine is required to output 20.0 kJ of work per cycle, how much heat must the high temperature reservoir transfer to the engine during each cycle? A) 27.5 kJ B) 73.2 kJ C) 39.2 kJ D) 800 kJ E) 20.5 kJ
The vibrational frequency of an HF molecule is 8.72 × 1013 Hz and the reduced mass of the molecule is 1.589 × 10-27 kg
What is the ground state vibrational energy of an HF molecule? (1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 0.30 eV B) 0.18 eV C) 0.12 eV D) 0.36 eV E) 0.24 eV
Compound Microscope: In a compound microscope
A. both the objective and the eyepiece form real images. B. magnification is provided by the objective lens and not by the eyepiece. The eyepiece merely increases the resolution of the image viewed. C. magnification is provided by the objective and not by the eyepiece. The eyepiece merely increases the brightness of the image viewed. D. the magnification is m1 + M2, where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece. E. the image of the objective serves as the object for the eyepiece.