Radiation Lowersixth Science Physics

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Test knowledge on radiation in physics.

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Radiation Lowersixth Science Physics


Froggy Jumps Radiation Lowersixth Science PhysicsVersión en línea Test knowledge on radiation in physics. por YAKILI LMS 1 What does Stefan-Boltzmann law relate to? a Total power radiated per unit area b Weighing of photons c Heat capacity of a material 2 Which factor does Stefan-Boltzmann law depend on? a Color of surface b Absolute temperature c Material density 3 Wien's Law relates peak wavelength to what? a Absolute temperature b Surface area c Emissivity 4 If a black body is hotter, its peak wavelength shifts to: a Shorter wavelengths b Same wavelength c Longer wavelengths 5 What is emissivity a measure of? a Efficiency of radiative emission b Thermal conductivity c Reflectivity 6 Which surface emits radiation more effectively? a Higher emissivity surface b Lower emissivity surface c Polished metal only 7 Which surface generally emits more infrared radiation? a Matte black surface b Glossy aluminum c Shiny white surface 8 What is the main idea of absorption and emission in thermal radiation? a Matter absorbs and emits IR depending on temperature b IR is not exchanged c Only emits, not absorbs IR 9 Which law governs cooling by radiation in a body? a Boyle's Law b Newton's Law of Cooling c Hooke's Law 10 What does Newton's Law of Cooling relate? a Rate of cooling to temperature difference b Pressure vs volume c Phase change 11 Which factor does cooling rate depend on? a Surface color only b Volume only c Temperature difference with surroundings 12 What is a common unit for radiant power per area? a W/m^2 b N/m^2 c J/kg 13 Which spectrum does thermal radiation primarily lie in? a Infrared b Ultraviolet c Gamma 14 What factor increases total radiated power for a surface the most? a Increase in color contrast b Increase in temperature c Increase in mass 15 Which surface would appear hottest to the IR camera? a Polished metal b Surface with high emissivity c Surface with low emissivity 16 How does emissivity affect radiated heat? a Higher emissivity means less emission b Higher emissivity means more heat emission c Emissivity has no effect 17 Absorption of radiation primarily depends on: a Color alone b Material properties and temperature c Ambient humidity 18 What is the Stefan-Boltzmann constant value (approx)? a 1.0 W/m^2K b 3.14 W/m^2K^4 c 5.67 × 10^-8 W/m^2K^4 19 Which is NOT a method of heat transfer by radiation? a Emission of photons b Conduction c Infrared emission 20 Which law gives the relation between peak wavelength and temperature? a Kirchhoff's Law b Stefan-Boltzmann Law c Wien's Law 21 What happens to radiative emission when surface temperature doubles? a Radiant power increases by about 16 times b Remains the same c Halves 22 Which type of surface is a good radiator? a Glossy white surface b Matte black surface c Polished metal surface 23 Which quantity is constant for a blackbody in Stefan-Boltzmann law? a Absorption coefficient b Stefan-Boltzmann constant c Emissivity 24 Radiative heat transfer is best described as: a Particles colliding physically b Fluid motion c Energy transfer by electromagnetic waves 25 Which factor does not affect radiant heat transfer significantly? a Surface emissivity b Temperature c Ambient humidity 26 In Wien's Law, if the temperature increases, peak wavelength: a Stays same b Decreases c Increases 27 Which unit would describe radiant exitance? a J/kg b W/m^2 c N/m^2 28 Which surface emits the least radiation at a given temperature? a Matte black surface b Low-emissivity surface c High-emissivity surface 29 Which statement about absorption is correct? a Materials absorb some wavelengths more than others b No absorption occurs in solids c All wavelengths absorbed equally 30 What does Newton's cooling law predict? a Energy gain from environment b Temperature difference decay over time c Constant temperature forever 31 Which variable is NOT in Newton's cooling equation theta(t) - ambient? a Mass of air b Heat transfer coefficient c Surface area 32 Which is an application of radiation? a Boiling water by contact b Cooling via conduction c Solar heating 33 What is the main carrier of thermal radiation? a Protons b Electrons c Photons 34 Which factor would reduce radiative heat loss? a Higher temperature b Lower emissivity coating c Rough surface 35 Which statement is true about black bodies? a They reflect all radiation b They do not emit radiation c They absorb all incident radiation at all wavelengths 36 Which equation links temperature to radiant power per area? a P = σεAT^4 b P = mgh c P = kx 37 What does Wien's displacement constant determine? a Location of peak emission b Radiant intensity c Total energy 38 Which surface would emit most if at same T? a Surface with high reflectivity b Surface with high emissivity c Surface with low emissivity 39 What happens to emission if emissivity is 0.9? a Emits only visible light b Radiated power is high, close to blackbody c Radiated power is zero 40 Which mode of heat transfer can involve the greenhouse effect? a Radiation b Conduction c Convection 41 What is a practical example of radiation in daily life? a Feeling warmth from sunlight b Boiling water c Feeling warmth from a stove handle via contact 42 Which thermal property changes with wavelength? a Emissivity varies with wavelength b Density c Mass 43 An object at constant T emits more if its surface: a Is transparent b Is rough and dark c Is smooth and shiny 44 What is the unit of Stefan-Boltzmann constant? a J/kgK b N/m^2 c W/m^2K^4 45 Which factor does NOT influence Newton's Law of Cooling? a Chemical composition of air b Temperature difference c Surface area 46 Which example best illustrates radiation application? a Thermal imaging camera b Steel rod heating by contact c Ice cooling with water 47 What is the primary mechanism behind radiant heat transfer? a Mechanical conduction b Electromagnetic waves c Molecular diffusion 48 What happens to a cooler object near a hotter one? a It remains completely unaffected b It absorbs some radiation and warms c It instantly freezes 49 Which is true about blackbody radiation? a It is an ideal emitter and absorber b It reflects all radiation c It does not emit radiation 50 Which is a measurement of how hot an object looks in IR? a Absolute temperature b Thermal conductivity c Radiant temperature

Radiation Lowersixth Science Physics

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Radiation Lowersixth Science PhysicsVersión en línea

por YAKILI LMS

What does Stefan-Boltzmann law relate to?

Which factor does Stefan-Boltzmann law depend on?

Wien's Law relates peak wavelength to what?

If a black body is hotter, its peak wavelength shifts to:

What is emissivity a measure of?

Which surface emits radiation more effectively?

Which surface generally emits more infrared radiation?

What is the main idea of absorption and emission in thermal radiation?

Which law governs cooling by radiation in a body?

What does Newton's Law of Cooling relate?

Which factor does cooling rate depend on?

What is a common unit for radiant power per area?

Which spectrum does thermal radiation primarily lie in?

What factor increases total radiated power for a surface the most?

Which surface would appear hottest to the IR camera?

How does emissivity affect radiated heat?

Absorption of radiation primarily depends on:

What is the Stefan-Boltzmann constant value (approx)?

Which is NOT a method of heat transfer by radiation?

Which law gives the relation between peak wavelength and temperature?

What happens to radiative emission when surface temperature doubles?

Which type of surface is a good radiator?

Which quantity is constant for a blackbody in Stefan-Boltzmann law?

Radiative heat transfer is best described as:

Which factor does not affect radiant heat transfer significantly?

In Wien's Law, if the temperature increases, peak wavelength:

Which unit would describe radiant exitance?

Which surface emits the least radiation at a given temperature?

Which statement about absorption is correct?

What does Newton's cooling law predict?

Which variable is NOT in Newton's cooling equation theta(t) - ambient?

Which is an application of radiation?

What is the main carrier of thermal radiation?

Which factor would reduce radiative heat loss?

Which statement is true about black bodies?

Which equation links temperature to radiant power per area?

What does Wien's displacement constant determine?

Which surface would emit most if at same T?

What happens to emission if emissivity is 0.9?

Which mode of heat transfer can involve the greenhouse effect?

What is a practical example of radiation in daily life?

Which thermal property changes with wavelength?

An object at constant T emits more if its surface:

What is the unit of Stefan-Boltzmann constant?

Which factor does NOT influence Newton's Law of Cooling?

Which example best illustrates radiation application?

What is the primary mechanism behind radiant heat transfer?

What happens to a cooler object near a hotter one?

Which is true about blackbody radiation?

Which is a measurement of how hot an object looks in IR?