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A LASIK vision correction system uses a laser that emits 10 ns -long pulses of light, each with 2.5 mJ of energy. The laser is focused to a 0.75 mm -diameter circle.
Part A- What is the average power of each laser pulse?
Part B-What is the electric field strength of the laser light at the focus point? Express your answers using two significant figures.
If we observe a star's spectrum and find that the peak power occurs at the border between red and infrared light, what is the approximate surface temperature of the star
Two pellets, each with charge 5 microcoulomb (1 microcoulomb = 0.000001 coulombs), are located 0.5 m apart. What is electrical force between the charges.
Neutrons in thermal equilibrium with matter have an average kinetic energy of (3/2)kT, where k is the Boltzmann constant, What is the average kinetic energy of the neutrons
A 625 gram block is dropped onto a vertical spring with spring constant k =160.0 N/m. find what work is done on the block by its weight
A capacitor consists of two concentric conducting spherical shells with radii R1 and R2 = 4.0R1. It has capacitance C = 4.0 pF, and is charged to a potential difference of 60.0 V. by what factor does the stored energy change
lightning occurs when there is a flow of electric charge principally electrons between the ground and a thundercloud.
A person is on a weight scale in an elevator that is going up. When the elevator accelerates with acceleration a1, the reading on the scale is 2.00 x 102 lb, What is the person's actual weight
The electric field caused by a certain point charge has a magnitude of 6800N/C at a distance of 0.200m from the charge
When a mass of 25 g is attached to a certain spring, it makes 19 complete vibrations in 4.5 s. What is the spring constant of the spring
An engine does 20000 J of work and rejects 6120 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir.
question1the position of a particle moving along an x axis is given by x 12t2 - 2t3 where x is in meters and t is in
A sample of wood from an archaeological excavation is dated by using a mass spectrometer to measure the fraction of 14C atoms. What is the wood's age
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