Define atomic weight (or atomic mass)
What will be an ideal response?
Atomic weight is the number of protons plus neutrons in an atom.
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Spherical Mirrors: A person's face is 30 cm in front of a concave spherical shaving mirror. If the image is an erect image that is 1.5 times as large as the object, what is the focal length mirror?
A. 20 cm B. 50 cm C. 70 cm D. 90 cm
How do we determine the age of a star cluster?
a) by identifying the type of stars that have just turned off the main sequence b) spectroscopic parallax c) by determining the spectral types of the faintest stars in the cluster d) radioactive dating e) by comparing the ages of white dwarfs and red giants
In the SI, weight is expressed in units of ______________
Fill in the blank(s) with correct word
What are the three modes of heat transfer?
What will be an ideal response?