Why dies the liquid not come out of the dropper, unless the rubber id Pressed ?

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What is constructive interfernce?

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Why does fountain pen filler drew up ink ?

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Explain Solution ?

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A solar collection has been installed to heat water. A large water tank has a volume of 5.0 x 105 cm3. The area of the solar collectors is 8m2. (2 meters by 3 meters). If the water in the tank starts out with a temperature of 30°C in the morning, what is its temperature in the evening after the sun has set?

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Which element has the simplest absorption spectrum?

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What is sonar?

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What is the effect of using two converging lenses in one optical instrument?

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What is a Noise ?

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What is refraction of light?

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What is the Boiling ?

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What is the velocity of sound air?

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