Chloroform can be broken down by chemical means but not by physical methods. Thus chloroform is
a. a homogeneous mixture.
b. an element.
c. a compound.
d. a heterogeneous mixture.
c
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The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time. b. provide a backup system if one or more of the telescopes go down. c. to produce higher resolution images. d. to avoid interference between signals from the separate telescopes. e. to account for the motion of objects in the sky as a result of the Earth's rotation.
Normal body temperature for humans is 37°C. What is this temperature in kelvins?
a. 296 b. 310 c. 393 d. 273
An interpretation of the photoelectric effect is that:
1.Light is emitted only when electrons change orbits. 2.Light has a wavelike character. 3.Light is absorbed in quanta of energy E = h? 4.Electrons have an associated wave having wavelength ? = h/p. 5.Photons must have some minimum energy to penetrate a material. 6.More than one of the above
Answer the following statement(s) true (T) or false (F)
The point toward which compasses on the earth’s surface point is a magnetic south pole.