2.3.3. Radiation
A subsection of Physics, 5054, through 2. Thermal physics
Listing 10 of 32 questions
A type of nuclear reaction takes place at the centre of the Sun. The reaction releases thermal energy. State the name of the type of nuclear reaction that takes place at the centre of the Sun. Thermal energy is emitted from the surface of the Sun into space. The energy is transferred through the vacuum of space by thermal radiation. Describe the radiation that is emitted from the surface of the Sun. State the speed of this radiation in a vacuum. speed = The Earth is 1.5 × 1011 m from the surface of the Sun. Calculate the time taken for this radiation to travel to Earth. time = Explain one advantage of wearing white clothes on sunny days.
5054_w21_qp_21
THEORY
2021
Paper 2, Variant 1
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The fluorescent tube shown in converts electrical energy into light more efficiently than a filament lamp. fluorescent coating gas In the gas inside the tube, both light and ultra-violet radiation are produced. There is a fluorescent coating on the inside surface of the tube. Explain the purpose of the fluorescent coating. State the name of one region of the electromagnetic spectrum with wavelengths shorter than ultra-violet radiation. The ultra-violet radiation inside the tube has a wavelength of 3.6 × 10–7 m. Calculate the frequency of the ultra-violet radiation. (speed of light = 3.0 × 108 m / s) frequency =
5054_s11_qp_21
THEORY
2011
Paper 2, Variant 1
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shows a hollow metal cube filled with boiling water. The temperature of the four vertical surfaces are equal but each surface has a different colour or texture. metal cube thermal radiation sensor meter shiny white surface A thermal radiation sensor is placed the same distance from each surface and the meter reading measures the thermal radiation emitted from each surface. The results are shown in . Draw a line linking each type of surface with the appropriate meter reading. One line has been drawn for you. type of surface dull black dull white shiny black shiny white meter reading The hot surfaces produce a convection current in the air outside the metal cube. Describe how the convection current is produced.
5054_s21_qp_21
THEORY
2021
Paper 2, Variant 1
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Questions Discovered
32