Which particle in the free state is least stable?
a. electron
c. photon
b. neutron
d. proton
B
Physics & Space Science
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The law of reflection
a. applies only to plane mirrors. b. is limited to regular reflection. c. must be modified for diffuse reflection. d. applies to all reflecting surfaces.
Physics & Space Science
Radioactivity Basics: Neodymium 
Nd is an isotope that undergoes alpha decay. What isotope is the product of this decay?
A. 
Ba
B. 
Ce
C. 
Pr
D. 
Sm
E. 
Gd
Physics & Space Science
The Hubble time is actually the age the Universe would be if it were totally closed
Indicate whether the statement is true or false
Physics & Space Science
The loop’s front end has emerged from the field.
A. forward (in the +x direction). B. backward (in the -x direction). C. zero. D. some other direction (specify).
Physics & Space Science