What is the energy of a photon of red light that has a frequency of 4. 48 × 1014 hz?.

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Which of the following would be considered a nec code violation in regards to the installation of luminaires? a. an outdoor lighting fixture mounted to a tree b. a five-pound, 12-inch diameter light fixture supported by the screw shell of the lampholder c. florescent lay-in fixtures attached to the framing sections of a suspended ceiling with sheet-metal screws d. track lighting over a sink, 2 feet from a bathtub

Which of the answer is a characteristic of what osha calls "permit-required confined space? "