The key process of a laser is

a. stimulated emission.
b. Bremsstrahlung.
c. electron diffraction.
d. microwave absorption.


a

Physics & Space Science

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When a ray of light passes obliquely from one medium to another, which of the following changes?

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What is the quark composition of a ?°?

A) uud B) uus C) uds D) uss E) udd

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Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s

The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3. What is the speed of the air when it leaves the nozzle? A) 176 m/s B) 123 m/s C) 88.0 m/s D) 45.7 m/s E) 29.3 m/s

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A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -5.5 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?

a. 60 m b. 28 m c. 44 m d. 12 m e. 88 m

Physics & Space Science