1. Show and calculate the speed of the sound using the following frequency, Room 1 (3 kHz), Room 2 (5 kHz), Room 3 (2 kHz), Room 4 (1 kHz), Room 5 (1.5 kHz), Room 6 (5.5 kHz) (Non-anonymous question )) * T Upload file File number limit: 1 Single file size limit: 10MB Allowed file types: PDF, Image 2. Locate and measure a certain place in your room. Show and calculate the time echo return to you using the calculated speed of sound in your room from #1 Question. (Non-anonymous question) * T. Upload file File number limit: 1 Single file size limit: 10MB Allowed file types: PDF, Image 3. Based from calculated speed of sound of Question 1, if the echo reaches to you is 0.0250 second later. How far away are you from the wall? (Non-anonymous question ()) * 4. Based from previous question, you shouted at your room, and hear the echo in 0.0150 second. At this time, you turned on the aircon - the temperature of your room is now 12 degrees Celsius. How far away are you from the wall? (Non-anonymous question()) *