You drop a stone down a well. You hear the splash 2.23 s later. ...

[lidoalex]

You drop a stone down a well. You hear the splash 2.23 s later. How deep is the well? The speed of sound in air is 343 m/s.
 
  A)
 
  6.96 m
 
  B)
 
  20.2 m
 
  C)
 
  22.9 m
 
  D)
 
  18.8 m
 
  E)
 
  20.0 m

Question 2

The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. What is the angular magnification of the telescope?
 
  A)
 
  34
  B)
 
  480
  C)
 
  68
  D)
 
  0
  E)
 
  7.5

[TheNamesImani]

Answer to Question 1

C

Answer to Question 2

E

[lidoalex]

TYSM

[jojobee318]

Gracias!