Detect a star giving off more ultraviolet light than green light. What property of thestar can I estimate with this information?

a) Its chemical composition
b) Its temperature
c) Its density
d) Its age
e) Its distance from Earth


Answer: b) Its temperature

Physics & Space Science

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The tail of a comet ________.

A. always points away from the Sun B. always points toward the Sun C. trails behind the comet, pointing away from the Sun as the comet approaches it, and toward the Sun as the comet moves out of the inner Solar System D. points toward the Sun on its way into the Solar System, and away from the Sun on its way out

Physics & Space Science

Express an angle of 450° in radians

What will be an ideal response?

Physics & Space Science

A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side. You want to fill the screen as completely as possible without any of the image falling beyond the screen

Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens. (a) What magnification does the projector produce? (b) How far from the lens should the screen be placed? (c) What focal length projector lens is needed?

Physics & Space Science

When an electron changes from n = 3 to n = 2, a(n) ______________ is given off

Fill in the blank(s) with correct word

Physics & Space Science