The following statements all refer to the human brain when mental activity is occurring. Which statement is correct?
a. In order to detect electric currents in the brain, you must open the skull and make direct electrical contact with the brain.
b. The electric currents in the brain can be detected outside the brain by detecting the magnetic fields they produce.
c. The electric currents in the brain can be mapped by shaving a person's head and dropping iron filings on the head.
d. The electric currents in the brain produce an aura that can be detected visually.
e. The electric currents in the brain cannot be detected by any means.
b
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The discovery of extremophiles on Earth suggests that
A) life elsewhere will only be found under conditions that are similar to those of Earth B) life elsewhere will only be possible over a much narrower range of conditions than initially thought C) life elsewhere may be possible over a much wider range of conditions than initially thought D) extraterrestrial life will exist only under extreme conditions
The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective lens of diameter of 1.02 m
Suppose such an instrument were mounted on a satellite at an elevation of 300 km above the ground and used to map surface details. If the telescope is forming images with light of wavelength 550 nm, what is the minimum separation of two objects on the ground whose separation could be clearly resolved by this lens?
A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly above the fish? (For water, n = 1.33.)
a. 50 b. 60 c. 40 d. 70 e. 110
Twenty milliseconds is 0.020 s
Indicate whether the statement is true or false