A radioactive isotope of atomic number Z emits an alpha particle, and the daughter nucleus then emits a beta-minus particle. What is the atomic number of the resulting nucleus?
A) Z -1
B) Z + 1
C) Z - 2
D) Z - 3
A
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Three identical point charges Q are placed at the vertices of an equilateral triangle (length of each side = 2.0 m). If Q = 60 ?C, what is the magnitude of the electrostatic force on any one of the charges?
A. 25 N B. 19 N C. 14 N D. 22 N E. 16 N
Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity? a. 3 polarizing filters, each rotate beam by 30°
b. 2 polarizing filters, both rotate beam by 45°. c. 1 polarizing filter, rotating beam by 90°. d. None of the above, polarized light can't be rotated.
What direct evidence do we have that the weak and electromagnetic forces were once unified as a single force?
A) Particle accelerators on Earth can reach energies equivalent to the high temperatures of the Electroweak era and have produced particles predicted by the unified theory. B) Detectors on Earth have received photons and high-energy particles from the GUT era. C) The most advanced telescopes are able to see back to the GUT era in the universe. D) Temperatures in the center of the Sun can reproduce the conditions during the Electroweak era. E) We have no direct evidence of such a unified force.
The ultimate source of energy from fossil fuels is the
A) Sun. B) radioactivity in Earth's interior. C) photosynthesis process. D) natural processes in Earth's interior.