How do astronomers know that the newly found L and T spectral types represent objects cooler than M spectral class?
What will be an ideal response?
L star spectra contain bands produced by molecules such as iron hydride. T star spectra show absorption by methane and water vapor. Because these molecules can't exist in high-temperature stars, these objects must be relatively cool.
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The number of Type I and Type II supernovae observed are approximately equal
Indicate whether the statement is true or false
When there is a 5.00 A current through an 10.0-? device, how much power is being dissipated in the device?
A) 50.0 W B) 250 W C) 500 W D) 2.50 kW
Must all physically reasonable wavefunctions remain finite as 
, or does this apply only to solutions to the Schrödinger equation (B)?
A. 
B. Does this apply only to solutions to the Schrödinger equation
According to Newton, the closer gravitationally interacting objects are to each other, theA) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them
A) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them.