Which best describes the relationship between brightness B and distance d )? Inverse Square Law of Brightness The Apparent Brightness (B) of a source is inversely proportional to the square of its distance (d): Implications: It will appear 22=4 times brighter. Which type of dwarf is largest? A typical white dwarf is about as massive […]
What is the main characteristics of deciduous forests?
What is the main characteristics of deciduous forests? Deciduous forests have a long, warm growing season as one of four distinct seasons. There is abundant moisture. The soil typically is rich. The leaves dropped from trees provide a steady source of organic material for the soil. What are the characteristics of a deciduous tree? Most […]
Can you rotate your body in mid air?
Can you rotate your body in mid air? One cannot change one’s angular momentum in mid-air, other than by interaction with the air. A sky-diver, falling through the air after the first few seconds, is falling at “terminal velocity”. Can you rotate in the air? Jump into the air, you can turn your body. Physicists […]
When light interacts with matter 3 things can happen?
When light interacts with matter 3 things can happen? Light can interact with matter in three ways: absorption, transmission, and reflection. 1. ABSORPTION – When a light wave with a identical frequency to an electron’s natural frequency “impinges” upon an atom, the electrons will begin to vibrate as a result (almost like they are “set […]
What is the charge for calcium ion?
Can you get cancer from sitting in front of a heater?
Can you get cancer from sitting in front of a heater? We know what it is, but there have been very few direct sources of interference to the natural body functions, that result in the mutations of the cell divisions, that is commonly called ‘cancer’. Sitting in front of an “infra Red” heater, is not […]
What is a good weight to curl?
What are the causes and effects of eutrophication?
What are the causes and effects of eutrophication? “Eutrophication is an enrichment of water by nutrient salts that causes structural changes to the ecosystem such as: increased production of algae and aquatic plants, depletion of fish species, general deterioration of water quality and other effects that reduce and preclude use”. What can humans do to […]
Is tens AC or DC?
Is tens AC or DC? A standard TENS unit typically delivers a low-frequency (<50 Hz) alternating current to a focused treatment area. Due to the nature of low-frequency, however, these signals have a low capacity to overcome skin resistance – resulting in these units only providing pain relief via the Gate Control Theory while being […]