Saturn is less dense than water
Indicate whether the statement is true or false
TRUE
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The first postulate of special relativity states that ____
a. observers can always detect their uniform motion relative to other objects b. observers can never detect their uniform motion except relative to other objects c. the speed of light is constant regardless of location d. the speed of light in a vacuum is constant e. energy equals mass multiplied by the speed of light, squared
The largest known black holes:
A) create the dark nebulae in the plane of the Milky Way. B) can be no more than 1.4 solar masses, according to Chandrasekhar. C) lie in the cores of the most massive galaxies. D) can be no bigger than a small city, just like neutron stars. E) can be no bigger than the Earth, like white dwarfs.
Escape Speed: The mass of Earth is 9.31 times the mass of Mars, and the radius of Earth is 1.88 times the radius of Mars. The escape speed for Mars is what percent of the escape speed for Earth?
A. 222% B. 22.5% C. 44.9% D. 66.2% E. 20.2%
Silicon (Si) is used for night-vision infrared optics. Si is transparent to infrared radiation because the energy gap of Si is 1.1 eV. What is the longest wavelength photon that has sufficient energy to excite a valence electron across the energy gap?
What will be an ideal response?