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[object Object]
विषय
मुख्य विषय
अध्याय
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Give an example
Electrical energy changes of sound energy.
Chapter: [2] Work, Energy and Power
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Chemical energy changes to heat energy.
Chapter: [2] Work, Energy and Power
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Give an example
Chemical energy changes to electrical energy.
Chapter: [2] Work, Energy and Power
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Give an example
Light energy changes to electrical energy.
Chapter: [2] Work, Energy and Power
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Give an example
Electrical energy changes to heat energy.
Chapter: [2] Work, Energy and Power
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Find the kinetic energy of a car of mass 1000 kg traveling at 72 km/h.
Chapter: [2] Work, Energy and Power
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A bullet of mass 25 g has a velocity of 600 ms-1. What is the kinetic energy of the bullet? If it penetrates 50 cm into a target, find the resistive force offered by the target.
Chapter: [2] Work, Energy and Power
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A lead bullet moving at 70 ms-1 is brought to rest on hitting a target. If 80% of its energy is converted into heat energy, find the rise in temperature (Sp. Heat cap. Of lead is 140 J/kgK).
Chapter: [2] Work, Energy and Power
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If 60% of the potential energy available in a waterfall is converted into heat energy, find the height of the waterfall, when the temperature difference between the top and the bottom of the fall is 0.210C (sp. Heat cap. Of water = 4200J/kgK).
Chapter: [2] Work, Energy and Power
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How does the deviation produced by a triangular prism depend on the colours (or wavelengths) of light incident on it? Which colour deviates the most and which the least?
Chapter: [6] Spectrum
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Draw another diagram to show how the colours of spectrum of white light can be combined to give the effect of white light.
Chapter: [6] Spectrum
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The wavelengths for the light of red and blue colours are nearly 7.8 × 10-7 m and 4.8 × 10-7 m respectively. Which colour has the greater speed in vacuum?
Chapter: [6] Spectrum
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Fig shows part of the arrangement for obtaining pure spectrum.
(a) Complete thediagram and show how to obtain a pure spectrum.
(b) What are the conditions necessary for obtaining a pure spectrum?
Chapter: [6] Spectrum
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Distinguish between longitudinal and transverse waves.
Chapter: [7] Sound
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What do you understand by amplitude of an oscillation?
Chapter: [7] Sound
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State two factors on which the velocity of a wave depends.
Chapter: [7] Sound
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How does the velocity of a wave vary with temperature?
Chapter: [7] Sound
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The speed of a wave is 350 ms-1. Find the wavelength of the wave whose frequency is 700 Hz.
Chapter: [7] Sound
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Distinguish between crest and trough.
Chapter: [7] Sound
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