How does a shield affect radiation?
What will be an ideal response?
A shield decreases the radiation between two interacting surfaces and it
increase the thermal radiation resistance.
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The factor fnow, in the Drake equation depends on
A) whether a civilization ever develops intelligence B) whether a planet has any kind of life on its surface right now C) how technologically advanced civilizations become D) how long civilizations survive once they have arisen
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
a. 2.0 × 10^4 J. b. 2.5 × 10^4 J. c. 1.7 × 10^3 J. d. 1.5 × 10^3 J. e. 4.0 × 10^4 J.
Stromatolites are structures created by
a. algae. b. brachiopods. c. sea worms. d. trilobites.
Terminal Voltage and Internal Resistance: When an external resistor of resistance R1 = 14 ? is connected across the terminals of a battery, a current of 6.0 A flows through the resistor. When a different external resistor of resistance R2 = 64.4 ? is connected instead, the current is 2.0 A. Calculate (a) the emf of the battery and (b) the internal resistance of the battery.
Fill in the blank(s) with the appropriate word(s).