The spectra of the oldest stars show the most heavy elements
Indicate whether the statement is true or false
FALSE
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As compared to Jack, Jill does twice the work in half the time. Jill's power output is
A) the same as Jack's power output. B) one-fourth as much as Jack's power output. C) one-half as much as Jack's power output. D) twice Jack's power output. E) four times Jack's power output.
If a theory is testable, its underlying ________ and its ________ can be exposed to experimental verification
Fill in the blank(s) with correct word
Of the thousands of different isotopes known to exist,
a. most of them are radioactive b. only a couple can be used to build an atom bomb c. some are used in medical diagnosis and treatment d. most occur naturally e. all of the above
Which of the following is usually burned up in Earth's atmosphere?
a. Asteroid b. Meteoroid c. Meteor d. Meteorite