The isotope 99m Tc (half-life of 6.0 hours) is used in bone scans. How long does it take a quantity of 99m Tc to reduce to 1% of its initial activity?
A)
0.06 hours
B)
3.3 hours
C)
33 hours
D)
40 hours
E)
slightly more than one month
D
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At about what fraction of the speed of light do our fastest current spacecraft travel?
A) 1/2 B) 1/10 C) 1/100 D) 1/1000 E) 1/10,000
What is meant by the microwave observations of the cosmic background radiation revealing the "genetic code" of the universe?
What will be an ideal response?
When a laboratory sample of unknown mass is placed on a vertical spring-scale having a force constant (spring constant) of 467 N/m, the system obeys the equation y = (4.4 cm) cos(33.3 s-1 t). What is the mass of this laboratory sample?
What will be an ideal response?
Potential energy belongs to a system, and not to a single object alone
Indicate whether the statement is true or false