The valves or slide on a brass instrument a. help the player ...

[Engineer]

The valves or slide on a brass instrument
 
 

a. help the player to produce a stronger sound
  b. help the player to soften the sound
  c. help the player to change the timbre of the sound
  d. change the length of the tubing and thereby introduce a different overtone series
  e. produce a vibrato

Question 2

Sound is produced on all brass instruments when
 
 

a. the player depresses one or more valves
  b. air is blown through the instrument
  c. the player's tongue moves
  d. when the player's lip membranes vibrate as air passes between them
  e. the player silently forms certain vowels inside the mouth while blowing

[bobsmith]

Answer to Question 1

ANS: d.

Answer to Question 2

ANS: d.

[Engineer]

TY

[bobsmith]

You're welcome