A woman walks briskly at 2.0 m/s how much wile will it take her to walk one mile?
A. 8.3 min
B. 13.4 min
C. 21.7 min
D. 30.0 Min
Ans: B. 13.4 min
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A positive ion has a deficiency of
A) electrons. B) neutrons. C) negative ions.
When white light is dispersed in a prism, the fastest light is
A) red. B) orange. C) green. D) blue. E) same in all
Photoelectric Effect: Light of a given wavelength is used to illuminate the surface of a metal, however, no photoelectrons are emitted. In order to cause electrons to be ejected from the surface of this metal you should
A. use light of a longer wavelength. B. use light of a shorter wavelength. C. use light of the same wavelength but increase its intensity. D. use light of the same wavelength but decrease its intensity.
The central star in a planetary nebula
a. is a main-sequence star. b. is a pre-main-sequence protostar. c. is a neutron star. d. will become a white dwarf.