Which of the following has the highest frequency?
a) Visible light
b) Microwaves
c) Infrared
d) Radiowaves
Ans: a) Visible light
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From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude?
A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.
Briefly explain why antimatter is difficult to store after it is produced in laboratories
What will be an ideal response?
Which of the following could be a stable planetary orbit in a binary system?
A) a large orbit around both stars in a wide binary system B) an orbit close to one of the stars in a wide binary system C) a "figure-of-eight" orbit about both stars in a close binary system D) an orbit close to one of the stars in a close binary system
The type of mirror that will allow you to see large areas normally hidden from your view is __________
Fill in the blank(s) with correct word