Which of the following statements about atomic structure is false? a. In the Bohr model of the atom, electrons orbit around the nucleus in well-defined, allowed orbits
b. The mass of an atom is equally divided between the nucleus and the electron cloud
c. Atoms emit radiation when an electron makes a transition from one orbit to another
d. An atom can become ionized if it absorbs a photon with energy that is larger than the binding energy of one of its electrons

The energy of a photon was found to be 3.38 × 10–19 j. planck’s constant is 6.63 × 10–34 j • s. which color of light corresponds to this photon?

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Which accounts for an increase in the temperature of a gas that is kept a constant volume