The ratio of the energy of a photon to its frequency is
A) ?.
B) Planck's constant.
C) photon speed.
D) photon wavelength.
E) unknown.
Answer: B
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What was Tycho Brahe's contribution to astronomy? a. He proved that Earth rotates on its own axis and revolves around the Sun
b. He designed the three laws of planetary motion. c. He discovered satellites around Jupiter, which proved Earth could move and keep its satellite. d. He described why each of the planets moved in uniform circular motion. e. He compiled detailed observations of the positions of the Sun, Moon, and planets over a period of 20 years.
The temperature of a nice day is about
A) 25°C. B) 50°C. C) 0°C. D) 10°C. E) 70°C.
Which of the effects listed below is not a major effect influencing the binding energy of the nucleus in the liquid-drop model?
a. The volume effect: the binding energy per nucleon is approximately constant when A > 50. b. The surface effect: nucleons in the surface have fewer neighbors. c. The quantum number effect: all nucleons in the nucleus have the same set of quantum numbers. d. The Coulomb repulsion effect: protons repel protons. e. The symmetry effect: stable nuclei tend to have N ? Z.
By operating a reversible heat engine with an ideal gas as the working substance in a Carnot cycle and measuring the ratio Qc/Qh, we can calculate
a. n, the number of moles of the ideal gas. b. the ratio Vc/Vh of the volumes of the ideal gas. c. the ratio Pc/Ph of the pressures of the ideal gas. d. the ratio PcVc/PhVh of the products of volumes and pressures of the ideal gas. e. the value of Avogadro's number.