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Relation between frequency and wavelength (3140)
A spring is producing waves of frequency 4 Hz and wavelength 0.5 m. What is its velocity? What will be its wavelength if the frequency is double? What will be its wavelength if frequency is reduced to half?
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Velocity of a wave (2911)
The wavelength of a wave is 0.00015 m and its frequency is 7 000 Hz. What is the velocity of the wave?
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Heat transfer in fluids 0001
How is heat transferred in the air?
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Refraction and velocity of light 0001
The refractive index of green light in water is 1,42. What is its velocity when it travels through water?
(Velocity of light in a vacuum is 300 000 km/s).
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Matching terms: types of energy and systems 0001
Define, in your own words, what energy is and write two examples of systems; one with kinetic energy and other with gravitational potential energy. Match the terms to these two groups (letter-number):
a) Combustion of diesel ; b) Friction between a match and sandpaper ; c) A bee flying ; d) A plane that took off a minute ago ; e) A pole when is completely bent.
1) Kinetic energy ; 2) Elastic potential energy ; 3) Mechanical energy ; 4) Chemical energy ; 5) Internal energy