The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum
a. near the radio emission of water.
b. near the radio emission of oxygen molecules.
c. between the radio emission of hydrogen and oxygen.
d. between the radio emissions of hydrogen and OH.
e. near the radio band where water in the Earth's atmosphere strongly absorbs energy.
D
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Which of the following statements about electrons is not true?
A) They are composed of quarks. B) In an atom, an electron can have two possible values for its spin, usually called spin up and spin down. C) Electrons are one of the six known types of lepton. D) Electrons can behave both as particles and as waves.
The overall dimming of starlight passing through dust clouds is called ________
Fill in the blank(s) with correct word
An object is placed 25 cm in front of a lens of focal length 20 cm. 60 cm past the first lens is a second lens of focal length 25 cm. What is the resulting magnification of the object in this setup?
A.
B.
C.
D.
E.
A car is traveling at 30.0 m/s when the driver suddenly applies the brakes, giving the car a constant deceleration
The car comes to a stop in a distance of 120.0 m. What was the deceleration of the car? A) 3.75 m/s2 B) 4.00 m/s2 C) 4.25 m/s2 D) 4.50 m/s2 E) 4.75 m/s2