For a nova to occur, the system must have already been a(n):
A) astrometric binary.
B) detached binary.
C) spectroscopic binary.
D) mass-transfer binary.
E) eclipsing binary.
D
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A certain crystal has an interatomic spacing of 0.442 nm. A beam of neutrons moving with a speed of 1640 m/s is diffracted from the crystal. What is the de Broglie wavelength of the neutron?
A) 0.121 nm B) 0 nm C) 0.241 nm D) 0.484 nm E) 0.682 nm
Ocean tides are waves that have a period of 12 hours and a speed of 750 km/hr. What is their wavelength?
A) 9000 km B) 32,400 km C) 9000 m D) 32,400 m E) 2,500 m
An ideal gas is in contact with a heat reservoir to that it remains at a constant temperature of 300.0 K. The gas is compressed from 24.0 L to 14.0 L. The mechanical device that operating the piston to compress the gas expends 5.00 kJ of energy. How much heat flows between the gas and the heat reservoir?
A. -3.0 kJ B. -5.1 kJ C. -2.0 kJ D. -5.0 kJ
How many types of fundamental particles are there in the Universe and how many dominate on Earth?
A. About 30 with 3 dominant B. More than a million with 3 dominant C. About 300 with 30 dominant D. About 300 with 3 dominant E. About 30 with 15 dominant