A ruby laser delivers a 16.0-ns pulse of 4.20-MW average power. If the photons have a wavelength of 694.3 nm, how many are contained in the pulse

The  value is  

Explanation:

From the question we are told that

     The  amount of power delivered is  

      The  time taken is  

       The  wavelength is  

Generally the energy delivered is  mathematically represented as

Where   is the Planck's constant with value  

           c  is the speed of light with value  

So  

=>    

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

answeralert drivers who drift off the road;