If the newly discovered planet of Krypton has 100. times the mass of the Earth and 100. times the diameter of the Earth, what would be the period of a "low" orbiting satellite around Krypton?
A) 1.5 hours
B) 1.5 × 103 hours
C) 15. hours
D) 1.5 × 102 hours
E) 0.15 hours
D
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A soap bubble, when illuminated at normal incidence with light of 463 nm, appears to be especially reflective. If the index of refraction of the film is 1.35, what is the minimum thickness the soap film can be if it is surrounded by air?
What will be an ideal response?
The book shows a photograph of a human face, taken at shorter and shorter camera exposure times. What is observed at the shortest exposure times, and what does this observation demonstrate about the nature of light?
A) We observe a very dim but complete image of the face, showing that light is made of waves that have smaller amplitude as the light is reduced. B) We observe light and dark lines due to interference, showing that light is a wave. C) Individual white dots are distributed all over the photographic plate, showing that light is made of waves. D) We observe individual white dots at the center of the photograph, showing that the camera tends to focus individual photons at this point. E) Individual white dots were distributed randomly over the photographic plate, showing that light interacts with the screen in tiny bundles.
How many atoms are there in the width of a human hair?
A. 25 B. 125,000 c. 273,000,000,000 D. 6x10^23
In 1924, Edwin Hubble proved that the Andromeda Galaxy lay far beyond the bounds of the Milky Way, thereby putting to rest the idea that it might have been a cloud within our own galaxy. What key observation enabled him to prove this?
A) He observed individual Cepheid variable stars in Andromeda. B) He was able to measure the parallax of the Andromeda Galaxy. C) He found that the universe is expanding, and therefore concluded that Andromeda must lie outside our own galaxy. D) He was the first person ever to look through a telescope at the object we now call the Andromeda Galaxy.