The apparent brightness of a star is 1.0 × 10-12 W/m2 and the peak wavelength is 600 nm. Estimate its distance from us
A)
0.090 pc
B)
0.90 pc
C)
9.0 pc
D)
90 pc
E)
900 pc
D
Physics & Space Science
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A drawing is placed 40 cm in front of a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the drawing, what is the focal length of the lens?
A) -45 cm B) 75 cm C) 90 cm D) 200 cm
Physics & Space Science
A wiggle in time is a
A) vibration. B) wave. C) both of these D) none of the above
Physics & Space Science
If you draw a spacetime diagram, the worldline of an object that is stationary in your reference frame is
A) vertical. B) horizontal. C) slanted. D) curved. E) a circle.
Physics & Space Science
What is a gray body?
What will be an ideal response?
Physics & Space Science