Which of the following is not one of the Bohr postulates?
1.The laws of classical physics apply to orbital motion of the electrons but not during transitions from one orbit to another.
2.The possible energies that the electron can have are discrete and depend on the orbit radius.
3.Electrons emit electromagnetic radiation only during transitions between orbits and not while in an allowed orbit.
4.Permissible orbits have an angular momentum which is an integer multiple of h/2?.
5.The frequency of the radiation emitted during a transition is related to the energy difference between the orbits by f = ?E/h.
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A neutrino is ______________
a. a photon of light b. a positively charged particle c. a subatomic particle d. a negatively charged particle
When you see the bright flash of a meteor, what are you actually seeing?
A) emission of visible light from a particle that has not yet entered Earth's atmosphere B) the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere C) a star that has suddenly shot across the sky D) the flash that occurs when a speeding rock from space hits the ground
Identify the FALSE statement. Differentiation of large planetesimals and protoplanets:
is the process by which these bodies develop internal layering. began with heating up component materials within these bodies. was caused by heat created by the transformation of kinetic energy from collisions into thermal energy. was inhibited if radioactive elements were present because their decay required heat input from the surroundings. resulted in a central ball of iron alloy (the core) and an outer shell of lighter rocky materials (the mantle.)
What is the unit of electric current?
a. The volt. b. The joule. c. The coulomb. d. The ampere. e. The watt.