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A ruby laser emits an intense pulse of light that lasts a mere 30 ns. The light has a wavelength of 690 nm , and each pulse has an energy of 700 mJ.
A. How many photons are emitted in each pulse?
B. What is the rate of photon emission, in photons per second, during the 30 ns that the laser is "on"?
Copper has an electrical resistivity %u03C1 = 1.72 x 10-8 %u03A9m. What is the electrical resistance of a copper wire with a radius of 1.0 mm and a length of 25 m
The Sun radiates energy at a rate of about 4×1026W. At what rate is the Sun's mass decreasing
How much higher would the ball have gone in a vacuum. The time constant of an RC circuit is 4.8 s. How much time t is needed for the capacitor (uncharged initially) to gain one-half of its full equilibrium charge.
A converging lens with a diameter of 26.00 cm forms an image of a satellite passing overhead. The satellite has two green lights (wavelength 500 nm) spaced 1.24 m apart.
A rock climber stands on top of a 53{\rm m} -high cliff overhanging a pool of water. He throws two stones vertically downward 1.0{\rm s} apart, What is the speed of the first stone as it hits the water
when 105 mL of water at 22 C is mixed with 68mL of water at 95 C, what is the final temperature? suppose no heat is lost to the surroundings and density of water is 1 g/mL.
A barge on the Ohio river is 35 ft wide and 200 ft long with walls which are 12 ft high. One day you see it going up river empty and 10.5 ft of the barge is above water. What is the mass of the barge
A parallel-plate capacitor has circular plates of 9.27 cm radius and 1.79 mm separation. Calculate the capacitance in picofarads (pF)
Three identical masses of 360kg each are placed on the x axis. One mass is at = -110cm , one is at the origin, find the magnitude of the net gravitational force on the mass
A 50cm long non-conducting cylinder of radius 4cm has a volume charge density of 30 uC/m^3. A grounded conducting cylindrical shell of radius 6cm is placed concentrically around the charged cylinder.
A square, perfectly reflecting surface is oriented in space to be perpendicular to the light rays from the Sun, What is the radiation force on the surface from the light rays
Two large, non-conducting plates with the indicated area charge densities are suspended 3.67 cm apart, What volume of the air in region B (between the plates) stores an equal amount of energy
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