A capacitor C is connected in series with a resistor R across a battery and an open switch. If a second capacitor of capacitance 2C is connected in series to the first, the time constant of the new RC circuit will be
A) the same as before.
B) larger than before.
C) smaller than before.
D) variable.
C
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Given that there are several hundred billion stars in the Milky Way Galaxy and preliminary data from exoplanet studies suggest that as many as one in five star systems may have one or more habitable planets, then a reasonable estimate for the number
of habitable planets could be about A) 100 billion or more B) 1 billion or more C) 100 million or more D) 10 million or more
Of normal matter, about 25% of it by mass is still primordial helium even today
Indicate whether the statement is true or false
A metal surface is illuminated with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, electrons are ejected
A) at the same rate, but with more energy per electron. B) at the same rate, but with less energy per electron. C) at an increased rate with no change in energy per electron. D) at a reduced rate with no change in energy per electron.
Latent Heats: The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If LF is the latent heat of fusion of this substance and LV is its latent heat of vaporization, what is the value of the ratio LV/LF?
A. 5.0 B. 4.5 C. 7.2 D. 3.5 E. 1.5