Please solve this problem
H o w   d o   a s t r o n a u t s   c o m m u n i c a t e   o n   t h e   s u r f a c e   o f   m o o n     i n   t h e   a b s e n s e   o f   a n y   a t m o s p h e r e   ?   Y o u   s e t   y o u r   w a t c h   b y   t h e   s o u n d   o f   a   d i s tan t   s i r e n .   W i l l   i t   g o   f a s t   o r   s l o w ? E x p l a i n .   A   p e r s o n   s tan d i n g   n e a r   a   r a i l w a y   l i n e   h e a r s   t w o   d i s t i n c t   s o u n d s   o f a n   a p p r o a c h i n g   t r a i n .   T h e   t i m e   i n t e r v a l   b e t w e e n   t h e s e   s o u n d s   i s   2   s .   H o w   m u c h   i s   t h e   d i s tan c e   o f   t h e   t r a i n ? V e l o c i t y   o f   s o u n d   i n   a i r =   340   r n s - l .   V e l o c i t y   o f   s o u n d   i n   S t e e l   =   16   t i m e s   v e l o c i t y   o f   s o u n d   i n   a i r .

Dear student,

If the person standing near a railway line hears two distinct sounds of a train, then the sounds are - one travelling through steel and the another travelling through air.

Let the distance of train be d from the person.
speed of sound in air = 340 m/s
speed of sound in steel = 340×16=5440m/s
time taken by sound travelling through steel to reach the person = t_s
time taken by sound travelling through air to reach the person = t_a

time=distancespeedts=d5440ta=d340

given that t_a - t_s=2

d340-d5440=2or d(16-15440) =2d=2×544015d=725m

Distance of train is 725m

‚ÄčKindly post other questions in separate thread.



Regards

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