Physics, 24.07.2019 16:30 ayoismeisjjjjuan
Which of the following items best embodies the physical property of conductivity? a. a teak log that has a large amount of mass for its volume. b. a diamond that is not easily scratched. c. a white cotton shirt that reflects all wavelengths of light. d. a copper penny that easily transmits electricity.
Answers: 2
Physics, 22.06.2019 00:00, izearaholland7308
What type of nuclear decay causes the atomic number of an element to increase by 1?
Answers: 1
Physics, 22.06.2019 00:30, WorkingButNotReally
Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame
Answers: 2
Physics, 22.06.2019 11:20, ashtonbillups
More solar radiation is absorbed by earth’s surface than by
Answers: 1
Physics, 22.06.2019 17:00, WorkingButNotReally
If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction
Answers: 3
Which of the following items best embodies the physical property of conductivity? a. a teak log th...
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