Author Question: A chain reaction can occur A) in any uranium core. B) when critical mass is reached. ... (Read 40 times)

Haya94 · **on:** Jul 29, 2018

A chain reaction can occur

A)

in any uranium core.
B)

when critical mass is reached.
C)

when critical mass is exceeded.
D)

in the center of the Sun.
E)

when the coolant is too hot.

Question 2

A doubly convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?

A)

70 cm
B)

63 cm
C)

75 cm
D)

66 cm
E)

58 cm