The apparent brightness of a star is 1.0 10-12 W/m2 and the peak ...

[torybrooks]

The apparent brightness of a star is 1.0  10-12 W/m2 and the peak wavelength is 600 nm. Estimate its distance from us.
 
  A)
 
  0.090 pc
  B)
 
  0.90 pc
  C)
 
  9.0 pc
  D)
 
  90 pc
  E)
 
  900 pc

Question 2

Assume a proton in a 1-dim box of width 3.0 fm is in its 1 st excited state. (a) What is its kinetic energy (in eV)? (b) How close (fm) to the wall of the box is the probability density a maximum?
 
  What will be an ideal response?

[Jordin Calloway]

Answer to Question 1

D

Answer to Question 2

(a) 91. MeV
(b) 0.75 fm

[torybrooks]

Gracias!

[Animal_Goddess]

Thanks for the timely response, appreciate it