A white board is placed 1 meter away from a helium neon laser. When the shutter of the laser is opened, a circular red spot of diameter 2 mm is observed on the white board. If the white board is moved toward the laser so that it is 0.5 meter away from the laser. Choose the diameter of the beam that is expected on the white board. Consider the divergence of the laser beam.
(a) 0.5 mm
(b) 1 mm
(c) 2 mm
(d) 4 mm
(e) 8 mm
Answers: 3
Physics, 21.06.2019 17:30
Sara is creating an experiment. her hypothesis states the following. if i increase the air in my tires, then i will get better gas mileage. if this is her hypothesis what column titles do we need in our date table? a. air pressure in tire (psi) and gas mileage (mph) b. air pressure in the atmosphere (psi) and gas mileage (mph) c. miles (m) and gallons per mile (g) d. old battery and new battery
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Physics, 22.06.2019 03:30
The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.
Answers: 3
Physics, 22.06.2019 09:00
When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.
Answers: 1
Physics, 22.06.2019 09:30
Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?
Answers: 2
A white board is placed 1 meter away from a helium neon laser. When the shutter of the laser is open...
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