A radioisotope has a half-life of ? at a temperature of 150 K. If its temperature is increased to 300 K, what will its half-life be?
A) 4?
B) 2 ?
C) ?
D) ?/2
E) ?/4
C
Physics & Space Science
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Where on Earth is the impact crater that scientists believe caused the extinction of dinosaurs?
a. Flagstaff, Arizona b. Chicxulub, Mexico c. Aricebo, Puerto Rico d. Mauna Kea, Hawaii e. Antarctica
Physics & Space Science
Atomic Nucleus: In a 
Nb nucleus, how many protons, neutrons, and electrons are found there?
A. 41, 52, 93 B. 41, 52, 41 C. 52, 41, 41 D. 41, 52, 0 E. 93, 41, 93
Physics & Space Science
The antineutron has a quark structure _________.
A. uud
B. udd
C. 
D. 
E. 
Physics & Space Science
The force of attraction between Earth and any object located on its surface is generally referred to as the object’s
a) mass. b) momentum. c) inertia. d) weight.
Physics & Space Science