The International System of Units (SI) has ______________ base units

a. four
b. six
c. seven
d. five


c

Physics & Space Science

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In our part of the universe, antimatter is

A) non-existent. B) plentiful. C) short-lived. D) long-lived.

Physics & Space Science

Ultrasound is used

a. to form images of internal organs. b. by bats to navigate. c. in automatic focus cameras. d. to control insects. e. all of the above

Physics & Space Science

An old bone sample contains 321 g of carbon and has an activity of 947 decays/min due to the carbon-14 in it. The half-life of carbon-14 is 5730 y. Assume that the activity of the atmospheric carbon is, and has remained, 0.255 Bq per gram of carbon

(a) How old is the sample? (b) What will be the activity of the sample 2000 y from now, in decays per minute?

Physics & Space Science

Which of the following components of the hydrologic cycle comprises the greatest volume of water on Earth?

What will be an ideal response?

Physics & Space Science