Explain the role of convection on the Sun's surface
What will be an ideal response?
Energy flowing toward the Sun's surface backs up like water behind a dam, and the gas begins to churn in convection currents. Hot blobs of gas rise, and cool blobs sink. In this region, known as the convective zone, the energy is carried outward not as photons but as circulating gas. Rising hot gas carries energy outward, but sinking cool gas is a necessary part of the cycle.
Heat flows upward as rising currents of hot gas and downward as sinking currents of cool gas. The rising currents heat the solar surface in small regions seen from Earth as granules.
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What is a T Tauri star?
A. any variable star B. a young star that exhibits variable light and outflowing gas C. any star found in the constellation of Taurus D. a red giant with a peculiar spectrum
What is an indication that a planetary moon may have been captured?
A) it revolves in retrograde direction, opposite to the direction of planetary spin B) it has a highly elliptical orbit C) it has an orbit which is inclined to the equator of the host planet D) all of these are indications
The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?
a. nearby presence of photons of same wavelength as those emitted b. high flux of electrons c. high voltage d. high temperature
If the potential in a region is given by V(x,y,z) = xy - 3z-2, then the y component of the electric field in that region is
A) x + y - 6z-3. B) -y. C) -x. D) x + y.