A helium-neon laser emits light with a wavelength of 6328 Å. What is the energy of a 6328 Å photon in joules?
(a) 2.179 x 10-19 J
(b) 3.139 x 10-19 J
(c) 5.448 x 10-19 J
(d) 6.328 x 10-19 J
(e) 2.179 x 10-18 J
What would you describe as the key result of the Rutherford experiment, in which a metal target was bombarded with a-particles?
(a) The a-particles were able to pass through the target.
(b) The particles were found to knock electrons out of the target.
(c) Some of the a-particles were deflected through large angles.
(d) Flashes of light were emitted when the a-particles hit the ZnS screen after they passed through the target.
(e) The experiment showed the need for better a-particle detectors.