Subject: Doppler effect and shock wave Date: Sat, 17 Jan 1998 20:49:55 +0700 From: Amrat Chawla <> To: Dear Sir, Even though I am in trading business, in my personal time I am very much interested in Physics and I bought some 1st year university text book to study Physics as hobby. But frankly, your web site give me a very clear lesson just in few days that I discovered your site I understand a lot !!. For example I try to understand the sonic-boom but even I read many time I still cant get it, but with just few minute of virtual experiment with 'Doppler effect and shock wave' it became clear to me !! Really thankyou very much for your site. I regard you as my teacher. With respect and best rgds. Amrat Chawla