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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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

At Titan, the lakes are made mostly of liquid

A) metallic hydrogen. B) nitrogen. C) carbon dioxide. D) methane. E) water.

Physics & Space Science

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