The power output of a laser is measured by its wattage, the number of joules of energy it radiates per second (1 w = 1 j s-1). a 300-mw krypton laser produces a beam of red light with a wavelength of 676.4 nm (6.764×10-7 m). (a) calculate the energy carried by each photon. (b) calculate the number of photons emitted by the laser per second.

Explanation:

It is given that,

Wavelength of red light,

Power of the laser,

(a) The energy carried by each photon is given by :

(b) Let n is the number of photons emitted by the laser per second. It can be calculated as :

Hence, this is the required solution.    

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.