There are only two grooves on a record—one on each side. The groove is cut in a spiral on the surface of the record. For stereophonic sound, a different sound is recorded in each wall of the groove. The pickup produces two signals, one of which goes to the left-hand speaker and one to the right-hand speaker. Stereophonic sound is produced by

Questions below are based on the passage shown below.     Arsonists are persons who set fires deliberately. They don’t look like criminals, but they cost the nation millions of dollars in property loss and sometimes loss of life. Arsonists set fires for many different reasons. Sometimes a shopkeeper sees no way out of losing his business and sets fire to it to collect the insurance. Another type of arsonist is one who wants revenge and sets fire to the home or shop of someone he feels has treated him unfairly. Some arsonists just like the excitement of seeing the fire burn and watching the... Show more

Questions below are based on the passage shown below.    

Arsonists are persons who set fires deliberately. They don’t look like criminals, but they cost the nation millions of dollars in property loss and sometimes loss of life. Arsonists set fires for many different reasons. Sometimes a shopkeeper sees no way out of losing his business and sets fire to it to collect the insurance. Another type of arsonist is one who wants revenge and sets fire to the home or shop of someone he feels has treated him unfairly. Some arsonists just like the excitement of seeing the fire burn and watching the firefighters at work; arsonists of this type have been known to help fight the fire.    

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