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Yiying	
  Lin	
  15621148	
  
LO7/8	
  
	
  
Short	
  answer	
  question:	
  
	
  
	
  
1. When	
  people	
  cannot	
  hear	
  someone’s	
  voice	
  clearly,	
  they	
  usually	
  put	
  a	
  hand	
  
beside	
  an	
  ear.	
  Can	
  they	
  hear	
  more	
  clearly	
  by	
  doing	
  this?	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
Answer:	
   Yes.	
   It	
   is	
   using	
   sound	
   wave’s	
   reflectivity	
   to	
   increase	
   the	
   ear’s	
  
receptivity.	
   	
  
	
  
	
  
2. Why	
  people	
  always	
  feel	
  that	
  they	
  are	
  talking	
  louder	
  in	
  an	
  empty	
  room	
  rather	
  
than	
  a	
  normal	
  room	
  tough	
  they	
  are	
  using	
  the	
  same	
  voice?	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
	
  
Answer:	
  Because	
  in	
  an	
  empty	
  room,	
  there	
  are	
  only	
  walls,	
  floor	
  and	
  ceiling,	
  
which	
  can	
  reflect	
  the	
  sound	
  waves,	
  and	
  the	
  distance	
  is	
  not	
  far,	
  so	
  the	
  original	
  
sound	
  and	
  echo	
  are	
  received	
  at	
  same	
  time	
  by	
  the	
  ear.	
  However,	
  in	
  a	
  normal	
  
room,	
   there	
   are	
   sofa,	
   bed	
   and	
   cupboard,	
   which	
   cannot	
   reflect	
   the	
   sound	
  
waves	
  as	
  strong	
  as	
  a	
  wall	
  can.	
  

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Physics lo

  • 1. Yiying  Lin  15621148   LO7/8     Short  answer  question:       1. When  people  cannot  hear  someone’s  voice  clearly,  they  usually  put  a  hand   beside  an  ear.  Can  they  hear  more  clearly  by  doing  this?                   Answer:   Yes.   It   is   using   sound   wave’s   reflectivity   to   increase   the   ear’s   receptivity.         2. Why  people  always  feel  that  they  are  talking  louder  in  an  empty  room  rather   than  a  normal  room  tough  they  are  using  the  same  voice?                         Answer:  Because  in  an  empty  room,  there  are  only  walls,  floor  and  ceiling,   which  can  reflect  the  sound  waves,  and  the  distance  is  not  far,  so  the  original   sound  and  echo  are  received  at  same  time  by  the  ear.  However,  in  a  normal   room,   there   are   sofa,   bed   and   cupboard,   which   cannot   reflect   the   sound   waves  as  strong  as  a  wall  can.