Index of Refraction: Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. What are the frequency and wavelength of the light in this liquid? (c = 3.0 × 108 m/s)
What will be an ideal response?
5.45 × 1014 Hz, 359 nm
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How do x-ray measurements help us measure the amount of dark matter in galaxy clusters?
A) The gravity of dark matter causes intracluster gas to be heated to very high temperatures, and the higher the temperature, the stronger the x-ray emission we will detect from the gas. B) Dark matter absorbs x-rays, so we can map the dark matter distribution by looking for absorption lines in x-ray spectra. C) Collisions between dark matter particles emit x-rays, allowing us to map dark matter with x-ray images.
Like Saturn's more famous ring system, Jupiter's ring is also made of ice, just older and dirtier than the bright fresh material at Saturn
Indicate whether the statement is true or false
In 1998 came the discovery of ________, which seems to overwhelm even gravity and all the dark matter in the final fate of the cosmos
Fill in the blank(s) with correct word
From what height above the surface of the earth should an object be dropped to initially experience an acceleration of 0.54g? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A) 2300 km B) 1700 km C) 5400 km D) 2900 km