How many of the infinite number of Balmer spectrum lines are in ...

[nelaaney]

How many of the infinite number of Balmer spectrum lines are in the visible spectrum range?
 
  A) none
  B) 2
  C) 4
  D) 6
  E) infinite

Question 2

Which of the following is a difficulty associated with interstellar travel?
 
  A) all three are difficulties
  B) the speed of light being the fastest possible speed we can travel
  C) the enormous amount of energy required to accelerate any ship to high speed
  D) the huge distances between the stars

[cascooper22]

Answer to Question 1

C

Answer to Question 2

A

[nelaaney]

Thanks for the timely response, appreciate it

[Viet Thy]

Wow, this really help