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a) Human skin is most sensitive to ultraviolet light of approximate wavelength 300 nm, I know the energy of the light is 6.626e-19 Jb) The threshold for sunburn occurs when 1 cm2 of skin absorbs about 1015 of these UV photons over an interval of several hours or less. How much energy is absorbed?c) What is the intensity of the UV light if it delivers this much energy in 5.80 minutes? (By way of comparison, the ultraviolet component of sunlight normally incident on the earth's surface at sea level ranges in wavelength from 310 nm to 400 nm, with a total intensity of about 40 W/m2.)
While eating lunch with friends Diana spots her boyfriend having lunch, and having a good time with, How fast must Diana through the apple so that it hits her boyfriend
A proton (charge = 1.6x10-19) travels through a magnetic field of 1.78T with a velocity of 2.3x105 m/sec. What is the magnitude of force experienced by the proton
A world-class sprinter accelerates to his maximum speed in 4s . He then maintains this speed for the remainder of a 100m race, What is his average acceleration for the entire rac
You measure an electric field of 1.35×106N/C at a distance of 0.141m from a point charge. There is no other source of electric field in the region other than this point charge. What is the electric flux through the surface of a sphere that has thi..
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles, What is the force between the two alpha particles
a 100 ohm resistor, a 0.100micro F capacitor, and a 300mH conductor are connected in series to a voltage source with amplitude 240 V, hat is the maximun voltage across the capacitorat resonance
A room with 2.9m high ceilings has a metal plate on the floor with V= 0V and a separate metal plate on the ceiling. How high does the ball go if the ceiling voltage is 3.5×10^6V
Compute the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.10 m above the ground.
A(n) 150 pF capacitor is connected in series with an unknown capacitor, and as a series combination they are connected to a 23.0 V battery, what is the unknown capacitance
A man is riding on a flatcar travelling at a constant speed of 9.10. He wishes to throw a ball through a stationary hoop 4.90 above the height of his hands in such a manner that the ball will move horizontally as it passes through the hoop.
Blue light of wavelength 446nm passes through a diffraction grating with a slit spacing of 1.5×10 ?3mm and makes a diffraction pattern on the wall. How many bright fringes will be seen
An automobile of mass m = 1100 kg is being towed by a truck whose driver observes that the tension in the rope is T = 3700 N, What is the work done to overcome friction in the car
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