Cygnus X-1 was discovered because it is a(n) ________ source in a(n) ________ system
Fill in the blank(s) with correct word
X-ray; binary
Physics & Space Science
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Hydrogen Balmer lines are essentially absent in the O and M type stars.
Answer the following statement true (T) or false (F)
Physics & Space Science
At Titan, the lakes are made mostly of liquid
A) metallic hydrogen. B) nitrogen. C) carbon dioxide. D) methane. E) water.
Physics & Space Science
The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 1 cm from this wire?
A) 2 ?T B) 4 ?T C) 6 ?T D) 8 ?T E) 10 ?T
Physics & Space Science
The time interval during which a nucleus has a 50% probability of decaying is its half life
Indicate whether the statement is true or false
Physics & Space Science