Atomic Nucleus: Name the first three isotopes of hydrogen, write their symbols in standard notation, and indicate which one is the most common and which one is the most unstable.
What will be an ideal response?
H is ordinary hydrogen, 
H is deuterium, and 
H is tritium. 
H is the most common and 
H is the most unstable.
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Calculate
One mole of Strontium-90 is decaying with a half life of 28. years. After 61. years, how much Strontium is left and what is its activity?
What will be an ideal response?
The de Broglie wavelength of a particle is inversely proportional to both its speed and its
a. spin. b. electric charge. c. volume. d. mass.
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren relative to the police car is 500 Hz, what is the frequency heard by an observer in the truck as the police car approaches the truck? (The speed of sound in air is 343 m/s.)
a. 396 b. 636 c. 361 d. 393 e. 617