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(a) Calculate the lowest energy of the electron in He+. Is it lower than that of H? Give a physical reason for your answer.
(b) If this electron absorbs a photon and makes a transition to the 2p orbital, what is the frequency of the absorbed photon?
A planar electromagnetic wave is propagating in the +x direction. What is the Poynting vector at the point P at that instant
A 2.10-cm-high insect is 1.50m from a 139-mm-focal-length lens. Where is the image? Follow the sign conventions, How high is the image
An old-fashioned vinyl record rotates on a turntable at 49rpm . What are the angular speed in rad/s and the period of the motion
A highway curve of radius 500 m is designed for traffic moving at a speed of 73 km/hr. What is the correct banking angle of the road.
A ball with a mass of 0.620 kg is initially at rest. It is struck by a second ball having a mass of 0.370 kg, find the change in the total kinetic energy of the two balls
A block of mass of 4kg is dragged 2m along a horizontal surface by a force F=30N acting on a 53 degree to the horizontal. Find change in kinetic energy of the block
You swing a 3.25-kg bucket of water in a vertical circle of radius 0.960m. Find the tension in the rope tied to the bucket at the top of the circle
What types of lifestyle changes will be brought about by living in a house whose space heating and hot water needs are supplied almost completely by the sun.
A 1.36 103-kg car traveling initially with a speed of 20.0 m/s in an easterly direction crashes into the rear end of a 9.00 103-kg truck moving in the same direction at 15.0 m/s. How much mechanical energy is lost in the collision
The barricade at the end of subway line has a large spring designed to compress 2.00 m when stopping a 1.00 x 10^5 kg train moving at 0,500 m/s. What speed would the train be going if it only compressed the spring 0.500 m?
An archer pulls her bow string back 0.40m by exerting a force that increases uniformly from zero to 25 N. How much work does the archer do in pulling back the bow.
What is the speed of the block while the spring is till now compressed by xf=0.14m.
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