light wave is a __________wave?
- transverse
- longitudinal
- electromagnetic
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gamma rays discovered by?
- newton
- marcony
- becqueral
- rontgen
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Marcony---->long radio waves
infra-red waves--->hershel
ultra-violet rays--->ritter
imp:electromagnetic waves of wavelength range 10^-3 to 10^-2 are called micro waves.
speed of sound waves is maximum in?
- solid
- gas
- liquid
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speed of sound______on/of frequency.
- independent
- depends
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speed of sound is minimum in?
- liquid
- gas
- solid
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speed of sound in a medium ________ with increase in temperature?
- increases
- decreases
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speed of sound is ______in humid air than in dry air.
- more
- less
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unit of intensity of sound?
- hertz
- watt/metre-square
- decibel
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women voice is of _____pitch than man?
- higher
- lower
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to establish an acho...minimum distance between observer and reflector should be________meter
- 11.6
- 11.7
- 16.6
- 16.7
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persistence of ear is?
- 1/10 second
- 10 milli second
- 100 milli second
- 1/100 second
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resonance happens due to matching of_______?
- frequency
- timeperiod
- velocity
- wavelength
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note:BOW waves-->when motor boat in a sea travels faster than sound, then waves just like shock waves are produced on the surface of water.These waves are called bow waves.
1 calorie=_____joule
- 4.2
- 4200
- 420
- 42
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kal fresh hoke aayenge....aur 100 sawaal physics se.....
stefans law?
- E= XT^3
- E=XT
- E= XT^2
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relative humidity is measured by?
- hydrometer
- humidity meter
- thermometer
- hygrometer
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relative humidity ________with _______in temp.
- decreases,increases
- decreases,decreases
- increases,increases
- increases,decreases
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