Hi!
Here are a few more questions from my students- anybody know the
answers?
1) What is the process by which fluorescent tubes burn out?
2) When a microphone is brought too close to an amplifier, one
hears the grating feedback squeal. Is that squeal always at
the same pitch? (It seems to be, though the student asking was
not sure) If so, why? In any case, how is the seemingly limited
frequency range of the squeal selected by the system?
3) What is the cause of the greenish sky sometimes seen during
"tornado weather"? Is the red end of the spectrum being scattered
away by large stirred-up dust specks? Absorbed by excess
water high in the air?
Thanks for any ideas!
Richard Halada
Berkner High School
1600 East Spring Valley
Richardson, TX 75081