The first hint of the role of asteroids in extinction of the dinosaurs came from:
A) finding the huge crater in the Yucatan.
B) finding dinosaur fossils with meteorites imbedded in them.
C) finding a layer of worldwide iridium enriched dust.
D) finding that dinosaurs were warm-blooded and smart.
E) finding that no volcanic eruptions were linked to their disappearance.
C
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Red-colored diode lasers for pointers and surveying are made from pnjunctions of the compound semiconductor GaAs that has an energy gap of 1.42 eV. What is the wavelength of the light from a GaAs laser?
What will be an ideal response?
The structure at dimensions of 10-9 m is called ______________structure.
Fill in the blank(s) with the appropriate word(s).
Which of the following occupies the smallest percentage of the electromagnetic spectrum?
A) radio waves B) microwaves C) visible light D) gamma rays
Which one of the following is the correct representation of the electromagnetic waves from longer wavelength to shorter wavelength?
A) radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays B) radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays C) radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays D) radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays E) radio waves, infrared, X-rays, microwaves, UV, visible, gamma rays