The smallest amount of a fissionable material that will give a self-sustaining chain reaction is called the
a. mass defect.
b. mass number.
c. atomic mass.
d. critical mass.
d
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A gas is placed in a container, which is immersed in an ice-water mixture as shown below
Which of the following lets you conclude that a compact object cannot be a neutron star and that it must be a black hole?
A) If the mass of the compact object is greater than about 0.5 solar masses B) If the mass of the compact object is greater than about 3 solar masses C) If the mass of the compact object is greater than about 1.5 solar masses D) If the mass of the compact object is greater than about 2 solar masses
Solenoid: An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A. 16 mT B. 4.9 mT C. 15 mT D. 6.0 mT E. 9.0 mT
The image formed by a single concave lens
A) is always real. B) is always virtual. C) could be real or virtual, depending on whether the object distance is smaller or greater than the focal length. D) could be real or virtual, but is always real when the object is placed at the focal point. E) is always inverted.