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A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. The ions all have the same charge and are accelerated through the same potential difference before entering the magnetic field. The beryllium and aluminum lines are separated by 2.700 cm on the photographic plate, and the unknown element makes a line between them that is 1.073 cm from the beryllium line.
(a) What is the mass of the unknown element?
(b) Identify the element, using its chemical symbol. (Note that there may be more than one correct answer.)
Consider an electron in a hydrogen atom, which is 0.050 nm from the proton in the nucleus, What electric field does the electron experience
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On planet Tehar, the freefall accelration is the same as that on Earth, but there is also a strong downward eletric field that is uniform close to the planet's surface. A 2 kg ball having acharge of 5 micro Coulombs is thrown upward at a speed of ..
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A hotel elevator ascends 140 {rm m} with a maximum speed of 4.59 {rm m/s}. Its acceleration and deceleration both have the magnitude of 1.93 {rm m/s^2}. How long does it take to make complete trip from bottom to top.
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