Radioactive Decay: A radioactive substance with a half-life of 3.0 days has an initial activity of 2400 Bq. What is its activity after 6.0 days?
A. 1200 Bq
B. 1800 Bq
C. 600 Bq
D. 300 Bq
E. 150 Bq
Answer: C
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A marble has a diameter of 2 cm. At what distance would the marble have an angular diameter of 1 arc second
a. 4.1 cm b. 4.1 miles c. 4.1 m d. 4.1 ft e. 4.1 km
One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. How long is the air column? The speed of sound in air is 343 m/s
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An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 10^6 m, R = 5.0 × 10^6 m, and M = 4.0 × 10^24 kg
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What limitation(s) make it impossible to travel between stars? I. Fuel requirements II. The tremendous distances between stars III. The finite speed at which objects can travel
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