Energy Problem Set 2

How do wavelengths of electromagnetic energy absorbed by materials on Earth compare to the wavelengths radiated by materials on Earth?

• The reradiated wavelengths are shorter

• The reradiated wavelengths are longer

• The absorbed and reradiated wavelengths are the same.

The temperature of an object is determined by the

• average kinetic energy of its molecules

• average potential energy of the molecules

• total kinetic energy of the object

• total potential energy of the object

The temperature of a stovetop is 65 Celsius. What is the equivalent Fahrenheit temperature?

• 126 F

• 132 F

• 144 F

• 149 F

A boulder falls freely from A to B. Which statement best explains the relationship between the height of the boulder and its potential and kinetic energy as it falls?

• Its potential energy decreases, and its kinetic energy increases.

• Its potential energy increases, and its kinetic energy decreases.

• Its potential and kinetic energy decrease

• Its potential and kinetic energy increase

Equal masses of lead, granite, basalt, and water at 5 Celsius are exposed to equal quantities of heat energy. Which would be the first to show a temperature rise of 10 Celsius?

• lead

• granite

• basalt

• water

During some winters in the Finger Lakes of New York, the lake water remains unfrozen even though the land around the lakes is frozen and covered with snow. The primary cause of this difference is that water

• gains heat during evaporation

• is at a lower elevation

• has a higher specific heat

• reflects more radiation

At what temperature will ice melt under normal conditions?

• 0 K

• 32 K

• 212 K

• 273 K

The change from gas or vapor phase, to the liquid phase is called

• evaporation

• precipitation

• condensation

• transpiration

Two identical towels are hanging on a clothesline in the sun. One towel is wet; the other is dry. The wet towel feels much cooler than the dry towel because the

• dry towel receives more heat energy from the sun

• dry towel has more room for heat storage than the wet towel

• presence of water in the wet towel requires an additional amount of heat energy to

• water in the wet towel prevents absorption of heat energy

Water loses energy when it changes phase from

• liquid to solid

• solid to liquid

• liquid to gas

• solid to gas