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A hydrogen atom initially in the n = 2 level emits a photon and ends up in the ground state.
(a) What is the energy of the emitted photon?
(b) If this atom then absorbs a second photon and returns to the n = 2 state, what must the energy of this photon be?
A force F = 200i - 400j + FZ k N, is acting through point A(0,0,0) m.
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8..00 m/s at an angle of 20.0 below the horizontal, Find the height from which the ball was thrown
A 13.0 kg bucket of water of is suspendedby a rope wrapped around a pulley, which is just a solid cylinder0.300 m in diameter with mass 17.0 kg. The cylinder is pivoted on a frictionlessaxle through its center.
q1. a fan at a rock concert is 30 m from the stage where the sound intensity level is 110 db. her eardrums have a
A narrow beam of light from a laser travels through air (n = 1.00) and strikes the surface of the water (n = 1.33) in a lake at point A. If refraction did not occur, how far away from point B would the laser beam strike the lake bottom
An object has an angular size of 0.0150 rad when placed at the near point (21.0 cm) of an eye. When the eye views this object using a magnifying glass, the largest possible angular size of the image is 0.0380 rad. What is the focal length of the magn..
A solid metal sphere with radius 0.590m carries a net charge of 0.300 nC. Find the magnitude of the electric field ata point 0.100 m outside the surface of the sphere.
Calculate the per capita energy use for China and India. The populations of each country should be obtained from reliable sources. Express your final answer in units of kcal per day per person.
Calculate the number of coulombs of positive charge in 270 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton and an oxygen atom contains eight protons.) I keep getting 1.4E7 and its showing up wrong.
A rifle is aimed horizontally at a target 100 m away. When the fired bullet strikes the target it is 1.5 cm below the aim point. What was the bullet's flight time
A glass lens with radii R1=+3.0cm and R2=+3.0cm has an index of 1.60 and a thickness of 3.0cm. Calculate the primary and secondary principle points
Dry air will break down if the electric field exceeds 3.0 ? 106 V/m. What amount of charge can be placed on a parallel-plate capacitor if the area.
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