What is the frequency range of a conch?

If you have a 4inch PVC pipe that is capped at both ends how much weight can a 8 foot section hold? What does conduction band represent in forbidden energy gap of pn- junction diode? Is phosphor bronze has high compressive strength? WHAT DO the letters MTR's mean in welding terms? How big in bytes are each of the 6 numeric primitive data types? In what year will robots take over? 5 examples of mechanical energy? Is the white dotted line on a power supply positive or negative? 5 Why Searching is slower in Linked-List than in Trees? Microphone acoustic energy? What is double shut off valve? Does UPS control fluctuation of voltage? why Phase and frequency synchronization is needed in coherent detection? When is source code freely available for a program? What is the diode and Why it is used in electronic circuits? Why was the steel plow invented? Advantages of a single-lap tile? How many diodes are used to make a half wave rectifier? How many objects of a given class can there be in a program? How do you convert an integer to Boolean array list in java?