day2: small fixes

day2/Task-B2.md

@@ -12,11 +12,9 @@ Run the application in interactive mode. Use the NIST data base:
   
 Exercise 2.  
 -----------
-From now on, we will use the application in batch mode. 
-
 - a. Identify and investigate the material definitions in yourDetectorConstruction::Construct() method!
 - b. Print the target material with all its properties (use G4cout)!
-- c. Change the target material from Water to liquid Argon using the NIST material data base.
+- c. Change the target material to liquid Argon using the NIST material data base.
 - d. Define your own Water material instead of the predefined NIST one (see   slide #9) and use it as the target material.
 
 Exercise 3.  

day2/Task-BX.md

@@ -32,7 +32,7 @@ Change target and world volume:
    - position  -25 cm   -5 cm  -5 cm
    - direction   1      0      0 
 
-Create the shower for 10 or 100 gammas
+Create the shower for 10 or 100 gammas (events)
 
 Compare with the case of primary muon
  - either in Generator Action