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Calculate the ratio of the rates of stimulated emission to spontaneous emission for a HeNe laser operating at 632.8nm. The laser has an output power of 1mW and a beam diameter of 1mm. The output mirror has 1% transmission at the laser wavelength and the width of the fluorescent line-shape is delta-nu =1.5GHz. Compare the rates at the central operating frequency. Hint: calculate A/B21 then invert it. Multiply by g(nu) I/c to get the required ratio. n.b. the ‘I' in the formula is Irradiance, check the definition.
What is the main possible displacement of the shopper
7.22 x1013 electrons flow through a transistor in 3.55 ms. What is the current (in mA) through the transistor
Small rockets are used to make small adjustments in the speed of satellites. One such rocket has a thrust of 53 N. If it is fired to change the velocity of a(n) 66000 kg space craft by 99 cm/s, how long should it be fired? Answer in units of s.
A motorist drives south at 20.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.00 min, and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.00 min trip, find (a) the total vector displacement, (b) the average speed, and..
There is a uniform charge distribution of lambda=7.65*10-8 C/m along a thin wire of length L=5.67 cm. compute the magnitude of the electric field at the center of the semicircle
An airplane has a mass of 1.7x10^6kg and the air flows past the lower surface of the wings at 96 m/s. If the wings have a surface area of 1200m^2, how fast must the air flow over the upper surface of the wing if the plane is to stay in the air?
A solid block of mass m2 = 0.5 , at rest on a horizontal frictionless surface, is linked to a relaxed spring (with spring constant k = 150 whose other end is fixed. Another solid block of mass m1 = 2.4 and speed v1 = 2.2 collides with the 0.50 blo..
A line of charge with uniform density of 28.0 nC/m lies along the line y = -15.0 cm, between the points with coordinates x = 0 and x = 32.0 cm
How much heat does an engine with an efficiency of 26.0% absorb in order to deliver 2.00 kJ of work, How much heat is exhausted by the engine
A 2.50-kg ball, moving to the right at a velocity of +3.83 m/s on a frictionless table, collides head-on with a stationary 8.10-kg ball. Find the final velocities of (a) the 2.50-kg ball and of (b) the 8.10-kg ball if the collision is elastic. (c) Fi..
A simple pendulum is 7.00 m long. What is the period of simple harmonic motion for this pendulum if it is located in an elevator accelerating upward at 5.00 m/s2
1. two 0.85-m-long pendulums hang side by side. the masses of the pendulum bobs are 75 g and 95 g. the lighter bob is
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