An atom's mass number is determined by the number of
A) neutrons in its nucleus.
B) nucleons in its nucleus.
C) protons in its nucleus.
D) alpha particles in its nucleus.
E) electron masses in its nucleus.
B
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Refracting Telescope: The angular magnification of a refracting telescope is 40. When the object and final image are both at infinity, the distance between the eyepiece and the objective is 143.5 cm. The telescope is used to view a distant radio tower. The real image of the tower, formed by the objective, is 6.0 mm in height. The focal point of the eyepiece is positioned at the real image. What is the angle subtended by the final image of the tower?
A. 0.15 rad B. 0.17 rad C. 0.19 rad D. 0.21 rad E. 0.23 rad
The observable universe is the same size today as it was a few billion years ago
Indicate whether the statement is true or false
A Cu-Ni alloy is produced that is 43 atom % Ni. At a temperature of 1260°C:
(a) What phases are present? (b) What are their chemical compositions? (c) What is the atom fraction of each phase present?
The rings of Uranus were discovered during a(n) _______________ when Uranus crossed in front of a star
Fill in the blank(s) with correct word