A deuterium nucleus and a tritium nucleus react to yield one alpha particle, a neutron, and energy. For this reaction, the sum of the masses of reaction products after the reaction is ________ the sum of the masses of particles before the reaction.
A. greater than
B. equal to
C. less than
Answer: C
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According to current evidence, Pluto is best described as
A) a large member of the Kuiper belt. B) a terrestrial planet that is surprisingly far from the Sun. C) a small jovian planet. D) an escaped moon of Jupiter or Saturn.
Mathilda collects photoelectric data in her physics laboratory. She measures a stopping potential of 5.82 volts for radiation of wavelength 100. nm, and 17.99 volts stops 50.0 nm
(a) What is the work function for the material in eV? (b) From her data one determines Planck's constant to be what?
What is the wavelength of a monochromatic light beam, where the photon energy is 2.15 eV? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 nm = 10?9 m, and 1 eV = 1.6 × 10^?19 J)
a. 308 nm b. 578 nm c. 223 nm d. 156 nm e. 475 nm
AC ammeters and voltmeters read:
1.peak-to-valley values 2.maximum values 3.rms values 4.average values