Do you speak a little English cuz I can’t help you if a can’t understand you
        
             
        
        
        
Answer:
 #_photon = 5 10²⁰ photons / s
Explanation:
For this exercise let's calculate the energy of a single quantum of energy, use Planck's law
          E = h f
          c= λ f
          E = h c / λ
           λ= 1000 nm (1 m / 109 nm) = 1000 10⁻⁹ m
Let's calculate
           E₀ = 6.6310⁻³⁴ 3 10⁸/1000 10⁻⁹
           E₀ = 19.89 10⁻²⁰ J
This is the energy emitted by a photon let's use a proportions rule to find the number emitted in P = 100 w
                 #_photon = P / E₀
                #_photon = 100 / 19.89 10⁻²⁰
               #_photon = 5 10²⁰ photons / s
 
        
             
        
        
        
Answer:29.627 m
Explanation:
Given
Initial velocity of life preserver(u) is 1.6 m/s
it takes 2.3 s to reach the water 
using equation of motion
v=u+at

v=24.163 m/s
Let s be the height of life preserver



s=29.627 m
 
        
             
        
        
        
There are 6 types of quarks.
Answer: C. 6
        
                    
             
        
        
        
D.
The gravitational of a body is possessed by the body due to the virtue of its position.
The formula for gravitational potential energy is,
                                 P.E = mgh joules
Substituting the values
196*9.8*250= 49k