The Hubble time is expressed as
A) H × D.
B) D/v.
C) 1/H.
D) H × T.
E) the critical density/H.
C
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Visible sunspots lie in the
A) chromosphere. B) transition zone. C) corona. D) radiative zone. E) granulation in the photosphere.
Which of these forms of energy is not renewable?
A) wind power B) solar power C) fossil fuel power D) photovoltaic power
As a water wave approaches a shoreline, wave speed
A) increases. B) decreases. C) is unchanged. D) and wavelength increase.
Electric Field of Point-Charges: The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could
A. double the distance to 2R. B. double the charge to 2Q. C. reduce the distance to R/2. D. reduce the distance to R/4. E. double the charge to 2Q and at the same time reduce the distance to R/2.