What modern-day instrument do astronomers use to record images from telescopes?
a. photometer
b. grating device
c. spectrograph
d. photographic plate
e. charge coupled device
e
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What are some new techniques and technologies that enable construction of optical telescopes with very large mirrors?
What will be an ideal response?
A transformation occurs in a material, and the Gibbs free energy change in the material is negative. The transformation is _____________.
Fill in the blank(s) with the appropriate word(s).
Comets with orbits that take them through the inner solar system shed sand- to pebble-size particles that then follow the comet around its orbit. How do these particles affect Earth?
A) They are the particles that produce meteor showers. B) They are the particles that produce the lights of auroras. C) They have been implicated in mass extinctions, including the extinction of the dinosaurs. D) On rare occasions, they can blanket our entire atmosphere with dust.
A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
a. 0.090 mT. b. 0.36 mT. c. 23 mT. d. 36 mT. e. 45 mT.