It is possible to observe the surface of a material in a TEM by making a(n) _________of the surface.
Fill in the blank(s) with the appropriate word(s).
replica
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What is a standard candle?
A) an object for which we are likely to know the true luminosity B) an object for which we can easily measure the apparent brightness C) a class of objects in astronomy that all have exactly the same luminosity D) any star for which we know the exact apparent brightness E) a long, tapered candle that lights easily
Billy swims to a point straight across a 100. m wide river that flows at 1.2 m/s. How long does it take him to swim to the other side?
What will be an ideal response?
An RC circuit is connected across a DC voltage source through an open switch. The switch is closed at t = 0 s. Which of the following is a correct statement regarding the circuit?
A) The capacitor charges to its maximum value in one time constant. B) The capacitor charges to its maximum value in two time constants. C) The resistor and the capacitor share the applied voltage equally as a function of time. D) The current flows through the circuit even after the capacitor is fully charged. E) Once the capacitor is fully charged, there is no current in the circuit.
Comets are composed of ______________
a. dust and ice b. rock c. helium d. lead e. iron