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A line in the x-ray spectrum of gold has a wavelength of 18.5 pm(=18.5x10^12 m) The emitted x-ray photons corresponds to a transition of the gold atom between two stationary states, the upper one of which has the energy -13.7 keV. What is the energy of the lower stationary state?
W hat is the ratio of an amplitude of the damped oscillations
A 95-{rm m}-long train begins uniform acceleration from rest. The front of the train has a speed of 25 {rm m/s} when it passes a railway worker who is standing 120m from where the front of the train started. What would be the speed of last car as ..
What is the velocity of observer B relative to observer A . A diver shines a light up to surface of a flat glass-bottomed boat at an angle of 36 relative to the normal.
Hexane (C6H14) burns with air (21 % O2, 79 % N2) in stoichiometric proportions. Also determine the mole fraction of each species in the product mixture
You stand on a frictional platform that is rotating at 1.3 rev/s. Your arms are outstretched, and you hold a heavy weight in each hand. What is the resulting angular speed of the platform
A slide projector needs to create a 96 cm-high image of a 2.20 cm-tall slide. How far should you place the lens from the slide.
A student holds a tuning fork oscillating at 256 Hz. He walks toward a wall at a constant speed of 1.20 m/s. What beat frequency does he observe between the tuning fork and its echo
The drawing shows a uniform horizontal beam attached to a vertical wall by a frictionless hinge and supported from below at an angle ?= 36o by a brace that is attached to a pin. Find the magnitudes of these three forces
The light from a distant star takes 252 years to reach the earth. How far away is the star from the earth
Consider a regular hexagon of side length, L=10cm. A charge, Q=2uc, is located at each vertex(there are 6). find the electostatic potential at the center of the hexagon
A light bulb is connected to a 120 V wall socket. The current in the bulb depends on the time t according to the relation I = (1.414 A) sin[ (125.6 Hz) t ]. What is the frequency of the alternating current
A pair of oppositely charged parallel plates are separated by a distance of 5 cm with a potential difference of 550 V between the plates. A proton is released from rest at the positive plate at the equal time that an electron is released from rest..
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