The proper abbreviation for ‘kilohertz' is __________
Fill in the blank(s) with correct word
kHz
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The evolution of a "high mass star" is different from the evolution of smaller stars because these stars ____
a. do not generate strong stellar winds b. rotate faster c. have stronger magnetic fields d. can ignite carbon fusion e. are never in binary systems
Easily identifiable navigational links are used to answer a website visitor's ______ question.
A. Who? B. What? C. Why? D. Where?
An apple falls from a tree and hits the ground 5 meters below with a speed of about
A) 5 m/s. B) 10 m/s. C) 15 m/s. D) 20 m/s. E) not enough information
What information does 21 cm radiation provide about the gas clouds?
A) their motion B) their distribution C) their density D) their temperature E) all of these