Physics Ray Optics Level: Misc Level
A light meter reads 2000 Ix when aimed at a point light source from a distance of 10 cm. What will it read when placed 80 cm from the source and aimed at the source?
Physics Ray Optics Level: Misc Level
All the light from a bulb is focused onto a wall. The lighted area is 600 cm2. The bulb emits a total luminous flux of 3000 Im. What is the illuminance at the wall?
Physics Ray Optics Level: Misc Level
Find the intensity of the Sun,s radiation at the planet Mercury. The distance of this planet from the Sun is 5.8x10 to the 10th m. Given the following:The intensity of the Sun,s radiation at the position of the Earth is 1340 W/m2. The earth to sun distance is 1.5x10 to the 11 th m.
Physics Ray Optics Level: Misc Level
How much luminous flux does a 40-cd isotropic point source emit?
Physics Ray Optics Level: Misc Level
How much flux does a bulb emit if its mean spherical luminous intensity is 40 cd?
Physics Ray Optics Level: Misc Level
A 5.0cm diameter light bulb hangs 1.50 m above a tabletop. Directly below the bulb is a pinhole through the very thin surface of the table. Find the diameter of the image formed of the bulb on the floor, 80 cm beneath the table.
Physics Waves And Oscillations Level: Misc Level
What frequency should a radio station have if its waves are to have a wavelength of 200 nm?
Physics Wave Optics Level: Misc Level
The red light from a helium -neon laser has a wavelength of 633 nm.. Find the frequency of this light wave.
Physics Current Electricity Level: Misc Level
A small motor draws a current of 1.75 A from a 120 V line. The output of power of the motor is .20 hp. At a rate of .60/kwh, what is the cost of operating the motor for 4 hours?
Physics Current Electricity Level: Misc Level
The output of power of the sun is (4.0x10^26W).Calculate @ 8 cents per kilowatt per hour the cost of runing the sun for one second.
Physics Current Electricity Level: Misc Level
A lightbulb has a tungsten filament with a resistance of of 19 ohm,s when cold and 140 ohm,s when hot. Find the temperature if the filament when it is hot.
Physics Current Electricity Level: Misc Level
A length of Lo copper wire has a resistance Ro. The wire is cut into three piecesof equal legnth. The pieces arre then connected as parrellel legnths between points A and B.What resistance will this new wire Lo/3 have?
Physics Current Electricity Level: Misc Level
If .00325 kg gold is deposited on the negative electrode of an electrolytic cell in a period of 2.78 hours, what is the current through the cell in this period. Assume that the gold ions carry one elementary unit of positive charge.
Physics Force & Laws Of Motion Level: Misc Level
A dog ,whose paw has an area of 10.0 cm2, has a mass of 13.0 kg What average pressure does the dog exert while standing?
Physics Properties Of Matter Level: Misc Level
How tall must a column of mercury, p-1.36x 104 kg /m3, be to exert a pressure equal to the atmosphere?
