Physics Ray Optics Level: Misc Level
Suppose that the lens system(cornea+lens) in a particular eye has a focal length that can very between 1.85 and 2.00 cm, but the distance from the lens system to the retina is only 1.90 cm, (a) Is this eye nearsighted or farsigted?Explain (b) What range of distances can the eye see clearly without corrective lenses? (Assume that the normal near point is 25 cm)
Physics Ray Optics Level: Misc Level
A photographer wishes to take a photograph of the Eiffel Tower.(300 m tall) from Across the Seine River,a distance of 300 m from the tower. What focal length lens should she use to get an image that is 20 mm high on the film?(For 35 mm film, each ''is 24 mm high by 36 mm wide).
Physics Ray Optics Level: Misc Level
A converging lens and a diverging lens, separated by a distance of 30.0 cm,are used in combination. The converging lens has a focal length 15.0 cm.The diverging lens is of unknown focal length. An object is placed 20.0 cm in front of the converging lens; the final image is virtual and is formed 12.0 cm before the diverging lens. What is the focal length of the diverging lens?
Physics Wave Optics Level: Misc Level
A laser beam with wavelength of 632.8 nanometer shines at the normal incidence on the reflective side of a compact disc. The tracks of tiny pits in which information is coded onto the CD are 1.60 micrometer apart. For what angles of reflection (measured from the normal 1) will the intensity of light be maximum?
Physics Wave Optics Level: Misc Level
Diffraction occurs for all types of waves, including sound waves.High frequency sound from a distant source with a wavelength 9.00 cm passes through a narrow slit 12.0 cm wide.A microphone is placed 40.0 cm directly in front of the center of the slit, corresponding to the O in the attachment. The microphone is then moved in a direction perpendicular to the line from the center of the slit to the point O. At what distances from O will the intensity detected by the microphone be zero.
Physics Wave Optics Level: Misc Level
An FM radio station has a frequency of 107.9 MHZ and uses two identical antennas mounted at the same elevation,12.0 m apart. The antennas radiate in phase. The resulting radiation pattern has a maximum intensity along a horizontal line perpendicular to the line joining the antennas and midway between them. Assume that the intensity is observed at distances from the antennas that are much larger than 12.0 m.At what angles (measured from the line of maximum intensity) the intensity is maximum and at what angle is it zero.
Physics Wave Optics Level: Misc Level
Coherent light from a sodium -vapor lamp is passed through a filter that blocks everything except for the light of a single wavelength. It then falls on two slits separated by 0.460 mm.In the resulting interference pattern on a screen 2.20 m away,adjacent bright fringes are separated by 2.82 mm.what is the wavelength?
Physics Ray Optics Level: Misc Level
prove that a ray of light reflected from a plane mirror rotates through an angle2 theta when the mirror rotates through an angle theta about an axis perpendicular to the plane of incidence
Physics Ray Optics Level: Misc Level
A horizontal, parallel-sided plate of glass having a refractive index of 1.52 is in contact with the surface of water in a tank.A ray coming from above in the air makes an angle of incidence of 35 degrees with angle does the ray refracted into the water makes with the normal to the surface and what is the dependence of this angle on the refractive index of the glass?
Physics Current Electricity Level: Misc Level
Nichrome wire is used in some radiative heaters. a) find the resistance neeeded if the average power output is to be 1.00 kW utilizing 120VAC. b) What length of nichrome wire having a cross section area of 5.00 mm^2 is needed if the operating temp is 500 deg C. C)what power will it draw when first turned on?
Physics Current Electricity Level: Misc Level
A resistor made of Nichrome wire is used in an application where its resistance cannot change more than 1.00% from its value at 20.0 deg c. Over what temp range can it be used? (nichrome resistivity=100*10^-8)
Physics Current Electricity Level: Misc Level
Find the voltage drop in an extension cord having a 0.0600 OHM resistance and through which 5.00 Amp is flowing. b) A chepaer cord utilizes a thinner wire and has a resistance of 0.300 ohm what is the voltage drop in it when 5.00 Amp flow.
Physics Heat & Thermodynamics Level: Misc Level
A cylinder containing monatomic gas and closed by a movable piston.The cylinder is submerged in an ice-water mixture.The piston is quickly pushed down from the top postion closer to the bottom. The piston is held there until the gas is again at 0 degrees celcius and then it is slowly raised back up to it,s orginal position. If 100 grams of ice are melted during the cycle, how much work has been done on the gas?
Physics Rotational Mechanics Level: Misc Level
A uniform spherical shell, with mass M and radius R, rotates about a vertical axis on frictionless bearings. A light string passes around the equator of the shell, over a massless,frictionless pully, and is attached to a small object of mass m.How long does it take the small object to fall a distance h?
Physics Current Electricity Level: Misc Level
An electric heater is basically a wire through which the electric current flows.What is the resistance of such a heater if its power is 1000W and its is used in a regular home so that the voltage is 110V.
