|
Two Scientific Problems/Questions (Physics)
I don't have a good mind for working out problems, especially without the Formula and examples!
The two questions I'm stuck on are:
1. The sound level is 90dB at 2 metres from a source. Calculate the sound level at 6 metres.
2. The daylight factor for a kitchen is 2% and the illuminance outside is 5000 lux. Calculate the expected illuminance inside the kitchen due to daylight.
Please only reply if you can give me some help. Thanks
[ ]
Want to answer more questions in the Work & School category?
Maybe give some free advice about: School?
Wow, I'm amazed at how much I've forgotten since high school physics... a little googling and I think I've remembered enough.
1. Sound pressure levels drop by 6dB every time the distance is doubled. This means that the sound level will decrease to 90-6-(6/2) = 81 dB. (I may be wrong on this one, though)
2. This is an easy one. Illuminance inside is equal to daylight factor times outside illuminance, so it will be 5000 * 2% = 100.
I've taken up to first year engineering physics at university, so I can usually answer any physics questions you might have. Feel free to ask anytime!
]
More Questions: |