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A line in the x-ray spectrum of gold has a wavelength of 18.5 pm (=18.5 x 10^-7 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?
a base for a building column measures 18.0 in. by 18.0 in. on a side and 12 in. high. compute the cross-sectional area
Consider a system consisting of three particles: m1 = 5 kg, 1 = m/s, m2 = 3 kg, 2 = m/s, m3 = 5 kg, 3 = m/s. What is the translational kinetic energy of this system
If the police car accelerates uniformly at 3.00m/s^2 and overtakes the speeder after accelerating for 9.00 s, illustrate what was the speeder's speed?
An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27 °C. A 500-g sample of silver at an initial temperature of 87 °C is placed in the water. Calculate the mass of the aluminum cup
A 250MW laser pulse is focused with a lens to a diameter of 2.5?m. What is the laser beam's electric field amplitude at the focal point
A centrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. Find the constant angular acceleration (in rad/s2) of the centrifuge
At 20.0°C, a mainly silicon resistor has a resistance of 665 ?, and a tungsten resistor has a resistance of 752 ?. At what temperature will their resistances be equal
q1. in a crash test a 1300 kg car slams into a concrete wall at 18.8 ms and comes to rest in 0.275 s. a find the
A car goes 13 miles east, then due North ending up 25 deg North of East from its initial position. How far due North did it travel
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1000 Hz. What is the speed of the bird
Three charged particles are fixed to an x axis: Particle 1 of charge q1 = 2.1e-8 C is at position x=20 cm and particle 2 of charge q2 = 2.00q1 is at position x = 30 cm, particle 3 of charge q3 = -4.00q1 is at position x = 70 cm.
Two 5.0-cm-diameter metal disks separated by a0.61-mm-thick piece of Pyrex glass are charged to a potential difference of 1300V. What is the surface charge density on the glass
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