What force holds the nucleus of an atom together?
A. Inter-nuclear attraction
B. Gravity
C. Van der Waals force
D. Strong nuclear force

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Which statement describes james chadwick’s discovery.