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WorksheetsConvection and Radiation
Total questions: 20
Worksheet time: 10mins
When an object is heated...
It radiates energy more per second, longer wavelengths
It radiates energy more per second, shorter wavelengths
It radiates energy less per second, longer wavelengths
It radiates energy less per second, shorter wavelengths
Which best describes heat transfer by radiation?
a camp fire warming hands
a hot air balloon
a pot on a stove boiling water
a slice of bacon frying in a pan
What feature helps reduce radiation in a vacuum flask?
The silvered surfaces
The insulation
The vacuum
The diagram shows 3 metal cans that are filled with 50°C water and are equipped with a thermometer. After an hour has passed, which can would have the hottest water.
Black Painted Can
White Painted Can
Shiny Metal Can
All cans are at the same temperature
True/False: Radiation cannot occur in a vacuum/space?
True
False
Which of these statements defines Radiation?
The process by which heat is transferred by movement of a heated fluid such as air or water.
The total kinetic energy of moving particles of matter
The transfer of heat arising from temperature differences between adjacent parts of a body.
The process by which energy, in the form of electromagnetic radiation, is emitted by a heated surface
The Earth receives heat energy from the Sun by ___________.
Radiation
Conduction
Convection
None of the above
What is causing the inside of a car to heat up drastically during a sunny day?
The outside shell of cars are always made of metals that conduct heat well from the Sun.
The Sun heats up the air around the car and the air convects into the car.
Sunlight going through the windows, then getting absorbed by interior surfaces, then emitted back to the air.
Darker colored surfaces are generally better at _____ radiation.
reflecting
absorbing and emitting
emitting
absorbing
Which of the following statements are true? (Choose all answers that apply)
Thermal radiation is mainly in infrared waves.
Thermal radiation is mainly in light waves.
Light waves can be emitted from very hot objects.
The hotter the object, the longer the wavelength
Based on the diagram, which of the following shows convection?
The movement and circulation of water transferring heat equally.
The saucepan heating up because it is above to a fire.
The electromagnetic waves emitted and heating up the air around the fire.
All the above
When air is heated...
Its mass increases, its volume increases
Its mass increases, its volume remains the same
Its mass remains the same, its volume increases
Its mass remains the same, its volume remains the same
The main source of heat transfer in saunas is _______
Convection
Radiation
Conduction
None of the above
Convection can take place in _________________.
solids only
liquids only
liquids and gases only
solids, liquids and gases
What is convection ? (Choose all answers that apply)
method of transfer of heat in fluids
method of transfer of heat in solids
transfer of heat due to vibration of molecules
transfer of heat due to movement of molecules
Heat transfer by convection is caused by differences in...
Density
Temperature
Temperature and density
Conductivity
What is an example of a convection current?
Touching a hot spoon that was in a soup bowl.
Feeling the suns rays on a nice summer day.
Touching an iron skillet after cooking and feeling the heat.
Movement of gas in a hot air balloon.
During convection, more dense water currents _________ and less dense currents _________.
Compared to the ocean, land heats up and cools down
Equally
Faster
Slower
Gradually
