UPC price scanners at supermarket checkouts use laser holography to read the bar codes because the packages are three dimensional
Indicate whether the statement is true or false
F
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A painting looks less flat when viewed with
A) one eye. B) both eyes. C) Polaroid glasses.
Suppose two flat glass plates 30-cm long are in contact along one end and separated by a human hair at the other end. If the diameter of the hair is 50 ?m, find the separation of the interference fringes when the plates are illuminated by green light, ? = 546 nm
An alpha particle (mass = 6.68 × 10^-27 kg) is emitted from a radioactive nucleus with an energy of 6.22 MeV. How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10^-13 J)
a. 3.70 × 10^6 m/s c. 1.55 × 10^7 m/s b. 1.73 × 10^7 m/s d. 1.85 × 10^6 m/s
The significant result of the Michelson-Morley experiment was that it found
a. the ether moved with the Sun. b. the ether moved with the Earth. c. the speed of the ether wind was greater than expected. d. no effect.