____ occurs when light travels out of a gravitational field, loses energy and its wavelength grows longer

a. A gravitational blue shift
b. The solar wind
c. A gravitational redshift
d. A X-ray burst
e. A pulsar wind

C

Physics & Space Science

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If an electromagnetic wave has its magnetic field oscillating in the vertical direction, the direction of oscillation of the electric field is

A) east-west. B) horizontal. C) vertical. D) north-south. E) circular.

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Hawking radiation

a. explains how stars gravitationally collapse to form black holes. b. causes the short lives of black holes. c. is due to one particle from particle-antiparticle pairs. d. explains the accretion disks around black holes. e. provides for an event horizon.

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Add and and express your answer in milligrams (mg)

A) 7.05 × 107 mg B) 7.05 × 104 mg C) 7.05 × 105 mg D) 7.05 × 106 mg

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Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat?

A) salt water B) fresh water C) Buoyant force is the same in both. D) Cannot be determined from the information given.

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