An alpha particle is another name for a(n)
a. electron.
b. proton.
c. neutron.
d. helium nucleus.
e. photon.
d
You might also like to view...
The terrestrial planets are thought to have formed by accreting solid planetesimals all with about the same composition. This means
a. they were initially molten forming an iron core first, then they accreted a silicate crust later. b. they were initially molten forming a silicate core first, then they accreted an iron crust later. c. they were initially collections of solid particles which melted then differentiated into a high density iron metal core and low density silicate crust. d. they were initially collections of solid particles which melted then differentiated into a high density silicate core and low density iron metal crust.
The terrestrial planets in our solar system are
A) Mercury, Venus, Earth, and Mars. B) Jupiter, Saturn, Uranus, and Neptune. C) Pluto and Eris. D) Mars, Jupiter, Saturn, Uranus, and Neptune.
A Carnot heat engine and an irreversible heat engine both operate between the same high temperature and low temperature reservoirs. They absorb the same energy from the high temperature reservoir as heat. The irreversible engine:
A. does more work B. transfers more energy to the low temperature reservoir as heat C. has the greater efficiency D. has the same efficiency as the reversible engine E. cannot absorb the same energy from the high temperature reservoir as heat without violating the second law of thermodynamics
The oldest hominid so far discovered dates back to
A) 540 million years ago B) 65 million years ago C) a few thousand years ago D) 6 to 7 million years ago