About how many extrasolar planets have been discovered (as of 2008)?
A) tens
B) hundreds
C) thousands
D) tens of thousands
C
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Two slits separated by 0.050 mm are illuminated with green light (? = 540 nm). How many bands of bright lines are there between the central maximum and the 12-cm position? (The distance between the double slits and the screen is 1.0 m.)
a. 1111 b. 111 c. 11 d. 1 e. 11111
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. How much tritium will be left after 30 years?
a. 0.20 kg b. 1.8 kg c. 0.18 kg d. 1.7 kg e. 4.1 kg
Lenz's Law: According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic field through the circuit.
A. True B. False
All neutron stars are pulsars, but not all pulsars are neutron stars
Indicate whether the statement is true or false