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The medical profession divides the ultraviolet region of the electromagnetic spectrum into three bands: UVA (320-420 nm), UVB (290-320 nm), and UVC (100-290 nm). UVA and UVB promote skin cancer and premature skin aging; UVB also causes sunburn, but helpfully fosters production of vitamin D. Ozone in earths atmosphere blocks most of the more dangerous UVC. Find the frequency range associated with UVB radiation.
Light strikes a sodium surface, causing photoelectric emission. The stopping potential for the ejected electrons is 3.2 V, What is the wavelength of the incident light
What is the response to the Naturalist concept that human personality, thought, and emotion are purely chemical and electrical reactions.
A radio station broadcasts with a power of 50,000 watts. Estimate the average intensity of the wave at a distance of 50 km from the radio transmitting antenna
The threshold of dark-adapted (scotopic) vision is 4.0 multiplied by 10-11 W/m2 at a central wavelength of 500 nm. how many photons per second enter the eye
What's the moxt orbital angular momentum that could be added to an atomic electron initially in the 6d state, What would be the new state
A motorboat is pointed due south, and its motor gives the boat a constant speed of 5.00 m/s through still water. Find the magnitude and direction of the boat's total velocity
A sled starts up an incline of 350 with the horizontal. The sled starts from the bottom with an initial velocity of 5 m/s. (a) How far u p the incline does it go? A second sled starts to slide from the top when the first sled starts to slide down...
You stand on a frictionless platform that is rotating at anangular speed of 1.2 rev/s. Your arms are outstretched, and you hold a heavyweight in each hand. What is the resulting angular speed of the platform
What provided the added kinetic energy? None of these is correct. the momentum of the platform the man moving the weights further away from his body the man pulling the weights closer to his body
A horizontal spring-mass system has low friction, spring stiffness 150 N/m, and mass 0.4 kg. What is the maximum speed during the motion
A solid bowling ball with a radius of 10.9 cm and a mass of 7.3 kg rolls along a bowling alley at a linear speed of 2.4 m/s
two parrel,very long straight wires separated by 10 cm are carrying 2.0 A and 4.0 A in opposite direction. where the magnetic field is Zero
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