At what rate are photons emitted by a 50. W sodium vapor lamp? ...

[joblessjake]

At what rate are photons emitted by a 50. W sodium vapor lamp? (Assume that the lamp's light is monochromatic and of wavelength 589. nm.)
 
  What will be an ideal response?

Question 2

A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. What is the initial speed of the ball?
 
  A) 9.8 m/s
  B) 20 m/s
  C) 35 m/s
  D) 4.9 m/s
  E) 70 m/s

[bitingbit]

Answer to Question 1

1.48  1020 per second

Answer to Question 2

C

[joblessjake]

Gracias!

[xiaomengxian]

Thanks for the timely response, appreciate it