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The threshold of dark-adapted (isotopic) vision is 2.0 multiplied by10-11 W/m2 at a central wavelength of450 nm. If light with this intensity and wavelength enters the eye when the pupil is open to its maximum diameter of 8.5 mm, how many photons per second enter the eye?
a converging lens with a focal length of 15 cm is used to form an image on a screen that is 1.8 m behind the lens. at
part a calculate the speed of a proton after it accelerates from rest through a potential difference of 150 v . express
A rotating cylinder about 12.00 km in length and 8.00 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it would experience the same acceleration because of gravity on Earth.
A uniformly charged sphere has a potential of 490 V on it's surface. At a radial distance of .24m from this surface the potential is 120 V. What is the radius of the sphere
a kangaroo jumps at an angle of 80deg above the horizontal with a velocity of 15 ms. if the mass of the kangaroo is 75
An electron is then fired directly toward the center of the shell, from point P at distance r from the center of the shell (r >> R). What initial speed v0 is needed for the electron to just reach the shell before reversing direction.
a 2. kg ball moving to the right with a speed of 25m/s collides with a 15. kg ball going in the same direction with the speed of 20 m/s. What is the speed of the second ball after collision if it travels in the same direction as before
When a person inhales, air moves down the bronchus (windpipe) at 17 cm/s. The average flow speed of the air doubles through a constriction in the bronchus. Assuming incompressible flow, determine the pressure drop in the constriction.
Monochromatic light from a distant source is incident on a slit0.700 mm wide. On a screen1.90 m away, the distance from the central maximum of the diffraction pattern to the first minimum is measured to be 1.15 mm. Compute the wavelength of the light..
an image of the moon is focused onto a screen using a converging lens of focal length f 36.8 cm. the diameter of the
The pressure exerted by a phonograph needle on a record is surprisingly large. what pressure is exerted on the record in N/m2
the relativistic heavy ion collider rhic at brookhaven iscolliding fully ionized gold au nuclei accelerated to an
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