Distinguish between conduction and convection. Give examples of each
What will be an ideal response?
Answer: Thermal conduction occurs when molecular bumping from warm to cool areas transfers kinetic energy. Convection occurs when atoms or molecules travel from one place to another in space. Whereas conduction occurs primarily in solids, convection occurs in fluids—liquids or gases. When cold water is poured into hot soup, the water soon spreads by convection to all parts of the mixture. When a spoon is placed in the hot soup, the whole spoon becomes hot by conduction as thermal energy moves from the soup to the spoon.
You might also like to view...
The element rubidium (Rb, atomic number 37) is in Group IA of the periodic table, thus the chemical bonding should be ______________.
Fill in the blank(s) with the appropriate word(s).
The planet Neptune is, on average, about 4.5 billion km from the sun. How long does it take light from the sun to reach Neptune? (Recall that the speed of light is about 300,000 km/s)
A) about 4 days B) about 4 hours C) about 4 seconds D) about 4 minutes
Where are the X-rays produced that are emitted by quasars and other active galactic nuclei?
A) in the hot gas in an accretion disk around a central black hole B) in dust grains in molecular clouds that encircle the active galactic nucleus C) in an ionization nebulae of interstellar gas surrounding the accretion disk D) in fast-moving jets of electrons that are ejected from the active galactic nucleus E) all of the above
A thin beam of light of wavelength 625 nm goes through a thin slit and falls on a screen 3.00 m past the slit
You observe that the first completely dark fringes occur on the screen at distances of ±8.24 mm from the central bright fringe, and that the central bright fringe has an intensity of 2.00 W/m2 at its center. (a) How wide is the slit? (b) What is the intensity of light at a point on the screen that is one-quarter of the way from the central bright fringe to the first dark fringe?