New surveys suggest brown dwarfs, stars under the critical mass for stable fusion, are probably very rare.
Answer the following statement true (T) or false (F)
False
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In the proton-proton chain
a. no neutrinos are produced. b. energy is released because a helium nucleus has a greater mass than a hydrogen nucleus. c. no photons are produced. d. carbon serves as a catalyst for the nuclear reaction. e. energy is produced in the form of gamma rays and the velocity of the created nuclei.
One mole of hydrogen, one mole of nitrogen and one mole of oxygen are held in a 22.4 × 10^3 cm3 enclosed vessel at 20°C. The pressure in the vessel, in N/m2, is
a. 109. b. 304. c. 326. d. 1.09 × 10^5. e. 3.26 × 10^5.
The radius of the Sun is 6.95 × 108 m. It radiates heat at the rate of 5.32 x 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of the Sun? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4)
A) 6.27 × 103 K B) 8.25 × 103 K C) 8.87 × 103 K D) 3.93 × 107 K E) 5.78 × 107 K
A magnetic field is directed out of the page. Two charged particles enter from the top and take the paths shown in the figure. Which statement is correct?
a.
Particle 1 has a positive charge and particle 2 has a negative charge.
b.
Both particles are positively charged.
c.
Both particles are negatively charged.
d.
Particle one has a negative charge and particle 2 has a positive charge.
e.
The direction of the paths depends on the magnitude of the velocity, not on the sign of the charge.