Why is hydrogen less obvious in B stars than in A class?
What will be an ideal response?
Above 10,000K, the hydrogen atoms are mostly ionized, and not able to absorb photons any more.
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Nebula that tend to be bluish in color are the
A) emission nebula. B) reflection nebula. C) dark nebula. D) cyan nebula.
Answer the following statement(s) true (T) or false (F)
Bell’s theorem shows that quantum theory contradicts any “hidden variable theory” that presumes that a quanton has objectively real properties
A 500-nm-wavelength beam of light illuminates a soap film with air on both sides and an index of refraction 1.33
If the beam of light is incident normally on the film, what is the minimum thickness of the film to make the reflected light enhanced in brightness? A) 47.0 nm B) 74.0 nm C) 94.0 nm D) 152 nm E) 268 nm
After 8.0 years have elapsed, 15/16 of a sample of a specific radionuclide has decayed. What is the half-life of the radionuclide?