The correct answer is<span> number of oscillations in a given period of time
This is measured in what is called the Hertz measurement and the period of time is usually taken to be per second.</span>
        
             
        
        
        
Answer:
oh I'm so sorry I can't answer your question it has been a long time since I learned that. so I totally forgot how to do this. sorry!
 
        
             
        
        
        
Answer:  beta particles
 beta particles 
Explanation:

Given mass = 14.0 g
Molar mass = 137 g/mol

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number  of particles.
 of particles.
1 mole of cesium contains atoms =   
 
0.102 moles of cesium contains atoms =   
 
The relation of atoms with time for radioactivbe decay is:

Where  =atoms left undecayed
 =atoms left undecayed
 = initial atoms
 = initial atoms
t = time taken for decay = 3 minutes
 = half life = 30.0 years =
 = half life = 30.0 years =  minutes
 minutes
The fraction that decays  :  
Amount of particles that decay is  = 
Thus  beta particles are emitted by a 14.0-g sample of cesium-137 in three minutes.
 beta particles are emitted by a 14.0-g sample of cesium-137 in three minutes.
 
        
             
        
        
        
Answer:
18.4 m
Explanation:
(a)
The known variables in this problem are:
u = 1.40 m/s is the initial vertical velocity (we take downward direction as positive direction)
t = 1.8 s is the duration of the fall
a = g = 9.8 m/s^2 is the acceleration due to gravity
(b)
The vertical distance covered by the life preserver is given by

If we substitute all the values listed in part (a), we find
