in a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively, what is the voltage across the capacitor?
In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that
A.
a gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume
B.
the gold nucleus is positively charged and is concentrated in a tiny volume
C.
the gold nucleus emitted alpha particles
D.
the gold nucleus is concentrated in a tiny volume and contains alpha particles