Why was deuterium so critical in the primordial nucleosynthesis?
What will be an ideal response?
Formed at 900 million K, when protons and neutrons fused, it was the critical link to forming both He-3 and finally He-4 in the first few minutes of creation.
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A 810-g quantity of ethanol, in the liquid state at its melting point of is frozen at atmospheric pressure
The heat of fusion of ethanol is 1.04 × 105 J/kg, the molecular mass is 46.1 g/mol, and the ideal gas constant is R = 8.314 J/(mol ? K). The change in the entropy of the ethanol as it freezes is closest to A) -540 J/K. B) -490 J/K. C) -600 J/K. D) 490 J/K. E) 540 J/K.
Large molecules found in meteorites and interstellar clouds are evidence that
A) life is abundant in the galaxy. B) life has definitely formed in other places than Earth. C) organic molecules are extremely rare. D) chemical evolution has taken place elsewhere in the universe. E) life originated on Mars before Earth.
An electron (m = 9.1 × 10^?31 kg) has a speed of 0.90c. What is the difference between its relativistic momentum and its non-relativistic momentum (in kg m/s)?
a. 4.3 × 10^?22 b. 3.2 × 10^?22 c. 5.4 × 10^?22 d. 6.5 × 10^?22 e. 2.5 × 10^?22
Two particles, each having a mass of 3.0 mg and having equal but opposite charges of magnitude of 6.0 nC, are released simultaneously from rest when they are a very large distance apart. What distance separates the two at the instant when each has a speed of 5.0 m/s?
a. 4.3 mm b. 8.6 mm c. 7.3 mm d. 5.6 mm e. 2.2 mm