An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
A) 4 electrons.
B) 6 electrons.
C) 10 electrons.
D) at least one electron.
A
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The ________ theory describes the origin of the planets as having been formed by accretion of small particles into progressively larger and larger bodies
Fill in the blank(s) with correct word
Two twin sisters, Gwen and Jackie, are both 20 years old in the year 2020. Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed very close to the speed of light—say, 0.9999c
According to Gwen back on Earth, about how long does it take Jackie to reach Vega? A) about a month B) about 10 years C) about 25 years D) about 100 years
The quantity "angular momentum" (in terms of the fundamental quantities of mass, length, and time) is equivalent to:
a. MLT?2 b. ML2T?1. c. ML2T?3 d. ML3T.
Star A has twice the absolute temperature of star B, but they both have the same radius. What is the ratio of star A’s power output to star B’s output due to electromagnetic radiation? The emissivity of both stars can be assumed to be 1
1.4 2.8 3.16 4.64