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Explain why, the flash of a gun shot reaches us before the sound of the gun shot.
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Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.
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A sound signal of 128 vibrations per second has a wavelength of 2.7 m. Calculate the speed with which the wave travels.
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State whether the following statement is true or false:
The symbol of element cobalt is CO.
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Name the element used as a standard for atomic mass scale.
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Which particular atom of the above element is used for this purpose ?
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A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air be 330 m/s, how much time will the sound of factory siren take to reach the worker?
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A worker lives at a distance of 1.32 km from the factory. If the speed of sound in air be 330 m/s, how much time will the sound of factory siren take to reach the worker?
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Give two symbols which have been derived from the "English names" of the elements.
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Give two symbols which have been derived from the " Latin names" of the elements.
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When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why?
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Which subatomic particle was discovered by : Chadwick ?
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Name the subatomic particle whose relative charge is : 0
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Give the names and symbols of five familiar substances which you think are elements.
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Name the elements represented by the following symbols :
Hg, Pb, Au, Ag, Sn
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Fill in the blank of the following statement :
If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is __________.
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Fill in the blanks with suitable words .
Wave speed in metres per second equals frequency in ............ multiplied by ..................... in ..................
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Fill in the blank with suitable word :
The speed of sound in a solid is ............... than the speed of sound in air.
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Fill in the blank of the following statement :
The subatomic particle not present in a hydrogen atom is ________
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If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then λ for this wave in cm will be :
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