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Q: Which has a higher root mean square speed at 22 Degrees Celsius argon or krypton?
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The loudness of a sound wave is determined by its?

By its amplitude. Really loudness is sound intensity & intensity depends on square of amplitude ie. higher the amplitude higher the intensity which means higher the loudness.


Which has a higher resistance 50W lamp bulb or a 25W lamp bulb and how many times?

R1=v square/50 R2 = v square/25 = v square/25 multiplied by 2/2 = 2v square/50 R2 = 2 multiplied by R1 R2 is twice more than R1


Is there less gravity at a higher height?

Yes. Gravity drops off at the square of the distance. So the further you are from something the less the force of gravity you experience.


How will you arrange two plain mirrors such that you can see your back while trying on clothes?

If you imagine a square around your body, put one mirror in front of you and to your right at about 45 degrees so it cuts off one corner of the square. Put the other to your back and right in the square at about 45 degrees. Now just turn your head to the mirror in front of you.


How does temperature affect mach number?

Mach no. is dependant on ambient air temp which is associated with a given altitude. As one ascends the temp drops so does the mach no. Eg. In a standard atmosphere (ISA - international std atmosphere) sea level temp is 15 degrees C or 59 degrees F. Temp decreases at 2 degrees celcius per 1000' therefore for example, in a standard atmosphere the temp at say 30000' would be: 15C at 0' -45C at 30000' Plug that into the equation to find the Local Speed of Sound (LSS) which is: LSS = 38.945 (square root of)/ Outside air temp + Absolute temp being 273A or 273K LSS = 38.945 x 228 LSS = 588 kts at 30000' So if one is doing 480knots at 30000' on a standard, day they are doing 480/588 = Mach0.82