The following images represent four types (wavelength bands) of light. Rank these from left to right based on the amount of each that is emitted (as thermal radiation) by Earth’s surface, from greatest to least. If you think that two (or more) types should be ranked as equal, drag one on top of the other(s) to show this equality.
Answer:
From left to right:
1. infrared
2-4. rest equal
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____________________ appear reddish in color due to the light emitted by the Balmer series of the hydrogen atom
Fill in the blank(s) with correct word
Compound Microscope: The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity. The near point of the microscope user is at 25 cm. What is the magnitude of the overall magnification of the microscope?
A. 250 B. 300 C. 350 D. 400 E. 450
Which of the following correctly describes the relationship between Newton's theory of gravity and general relativity?
A) Newton's theory of gravity is an approximation to general relativity that works when gravity is relatively weak but breaks down when gravity is strong. B) Newton's theory of gravity is now known to be false, and we were previously misled to think it was true by measurement errors. C) Newton's theory of gravity and general relativity give the same answers, but the former tells us to think of gravity as a force and the latter tells us to think of gravity as curvature of spacetime. D) General relativity applies at the subatomic level, but Newton's theory of gravity does not.
The first hint that the universe might be expanding came from Vesto Slipher's work with the spectra of spiral nebulae in 1912
Indicate whether the statement is true or false