Very large atoms, with atomic numbers greater than iron, generally form in a high-mass star and are disbursed by its "death" as a supernova explosion.
a. true
b. false
a. true
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Weather occurs in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
If we have a new moon today, when we will have the next full moon?
A) in about two weeks B) in about one week C) in about a month D) in about six months
A hunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time for crossing?
Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00 cm-wide slit. What is the total angular width (2q) of diffracted sound waves when the speed of sound in air is 340 m/sec
a. 167° b. 83.6° c. 19.5° d. 41.8° e. 0.11°