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.
E
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On the autumnal equinox, the Sun is:
A) 23.5° north of the celestial equator. B) 23.5° south of the celestial equator. C) on the celestial equator and moving north with respect to the equator. D) on the celestial equator and moving south with respect to the equator.
Conduction: In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section with dimensions 8.00 cm × 8.00 cm. After 5.00 min of running the experiment, 64.0 g of ice have melted. What is the thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg, the latent heat of vaporization of water is 2.256 × 106 J/kg, and both the ice and water are under 1.00 atm of pressure.
A. 0.130 W/m ? K B. 0.250 W/m ? K C. 0.440 W/m ? K D. 0.620 W/m ? K E. 1.12 W/m ? K
Which of the following best describes what we mean by the focal plane of a telescope?
A) It is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope. B) It is the upper surface of the telescope's primary lens or mirror. C) It is the lower surface of the telescope's primary lens or mirror. D) It is the surface of the lens on the eyepiece, through which you would look to see objects in the telescope's field of view.
A proton moves through a magnetic field of magnitude 1.40 T with speed 5.00 ´ 106 m/s. What is the magnitude of the maximum acceleration of the proton? The mass of a proton is 1.67 ´ 10–27 kg, and its charge is 1.6 ´ 10–19 C.
a. 3.42E+14 m/s
b. 6.71E+14 m/s
c. 3.35E+21 m/s
d. 1.71E+21 m/s