Test #2 Disc of Natural Science Exam Questions with Latest Update

What was the fundamental issue with the early 20th-century model of the atom we discussed that caused it to be discarded? - ANSWER-What was the fundamental issue with the early 20th-century model of the atom we discussed that caused it to be discarded? Electromagnetic radiation travels in the form of particles with wave properties known as - ANSWER-Protons Electrons Ions NONE OF THESE What is a good analogy to describe the behavior of an electron in a Bohr atom? - ANSWER-A staircase Why does the atomic emission spectrum of sodium consist of one yellow line? - ANSWER-Because only one type of quantum leap in the atom emits a photon of a wavelength we can see. An object glows because - ANSWER-energy is absorbed by the object's atoms, and then they release that energy as visible light energy when they move back to their ground state. A gas sample emits red light when a current is passed through it. What elemental gas is likely to be in the tube? (You may look this up on the internet.) - ANSWER-Neon An electron undergoes a quantum leap from energy level 4 to energy level 2. What must be true? - ANSWER-The electron released a photon. Suppose that the electron in a hydrogen atom is in energy level 3. Which statement is true? - ANSWER-The atom is in one of several possible excited states. An electron undergoes a quantum leap from energy level 1 to energy level 2. What must be true? - ANSWER-In order to do this it must have gained the amount of energy represented by the energy gap between levels 1 and 2. Electromagnetic waves are generated - ANSWER-when the velocity of electrons in a wire changes. A longitudinal wave causes particles of the medium to move - ANSWER-in the same direction that the wave is moving.