You are presently exerting a gravitational force on the Earth
a. True
b. False
Indicate whether the statement is true or false
True
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Which of the following does NOT happen to any of the material in the protoplanetary disk?
A. it is sucked in to a black hole at the center of our Solar System B. it gets incorporated into the star at the center, the Sun C. it is accreted onto planets in the Solar System D. it first falls into small irregularities and later these clumps grow into larger structures E. it is blown out by the solar wind
Matter Waves: Electrons with a speed of 2.1 × 106 m/s are directed towards a 1.0-?m wide slit. An electron detector is placed 1.0 m behind the slit. How wide is the central maximum of the electron diffraction pattern on the detector? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
A. 690 ?m B. 350 ?m C. 1000 ?m D. 1400 ?m
In alpha decay, the difference in the atomic
number (Z) between the parent nucleus and the daughter nucleus is a) 1 b) 2 c) 3 d) 4 •
Complex molecules in the interstellar medium are found:
A) uniformly throughout the disk of the Galaxy. B) scattered evenly throughout the universe, a product of the Big Bang itself. C) only around the supergiant stars like Betelguese that make their heavy atoms. D) primarily in the dense dust clouds. E) on the surfaces of the coolest class K and M stars only.