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Imagine you are waiting for a train to pass at a railroad crossing will the train whistle have a higher pitch as the train approaches you or after it has passed you by?
Wiki User
∙ 14y ago
A pleathorea of sounds, just go trackside and listen, from the piercing note of a horn, to the roar of the diesel engine to the click-clack of the wheels on the joints in the rail to the squeal of steel wheel on steel rail, there are hundreds of sounds to enjoy. "Choo Choo" doesn't cut it, sorry. Only the ignorant can agree that any train ever made this sound.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoThis is explained by the Doppler Effect. See the related link. When the train is moving, the sound waves produced by the siren are closer together in front and farther apart behind. When the train is approaching you, the sound is higher-pitched then when it has passed you.
Wiki User
∙ 11y agoCompared to its source, the sound you hear has a higher frequency if the source
is approaching you, and a lower frequency when the source is receding from you.
This effect is often noted in connection with the sound of a train's horn, whistle,
or bell. The pitch of the train is hardly ever discussed.
Wiki User
∙ 12y agoIt gets louder and then gets quieter
Anonymous
chou chou
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How to write c programme of Sleeping-barber problem in opertating system?
#define CHAIRS 5 /* # chairs for waiting customers */ typedef int semaphore; /* use your imagination */ semaphore customers = 0; /* # of customers waiting for service */ semaphore barbers = 0; /* # of barbers waiting for customers */ semaphore mutex = 1; /* for mutual exclusion */ int waiting = 0; /* customer are waiting (not being cut) */ void barber(void) { while (TRUE) { down(&customers); /* go to sleep if # of customers is 0 */ down(&mutex); /* acquire access to "waiting' */ waiting = waiting - 1; /* decrement count of waiting customers */ up(&barbers); /* one barber is now ready to cut hair */ up(&mutex); /* release 'waiting' */ cut_hair(); /* cut hair (outside critical region */ } } void customer(void) { down(&mutex); /* enter critical region */ if (waiting < CHAIRS) { /* if there are no free chairs, leave */ waiting = waiting + 1; /* increment count of waiting customers */ up(&customers); /* wake up barber if necessary */ up(&mutex); /* release access to 'waiting' */ down(&barbers); /* go to sleep if # of free barbers is 0 */ get_haircut(); /* be seated and be served */ } else { up(&mutex); /* shop is full; do not wait */ } }

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is waiting are waiting was waiting have waited had waited has been waiting
