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  

=>    

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.