The greenhouse effect occurs in the
A) troposphere.
B) stratosphere.
C) lithosphere.
Answer : A) Troposphere
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Energy in Inductors: A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in its magnetic field?
A. 2.0 mJ B. 10 mJ C. 20 mJ D. none of the given answers
Where does your body get the energy it uses to make your heart beat?
A) It comes from the radiative energy of the sunlight that hits your skin. B) It comes from the chemical potential energy of the food you eat. C) It comes from the thermal energy of the water you drink. D) It comes from the kinetic energy of the molecules in the air that you breathe in. E) It is created by your brain during the time that you rest or sleep.
A standard candle is
A) a 7-cm-long wax candle. B) another name for a main-sequence star. C) another name for a barred-spiral galaxy. D) a light source of known luminosity.
In the Bohr model of the hydrogen atom both the energy and orbital angular momentum of the electron are quantized
Indicate whether the statement is true or false