Answer: The variable that you manipulate is called the independent variable. The variable that you measure is called the dependent variable.
 
        
             
        
        
        
An atom is the smallest unit of matter. It can't be broken. It consist of dense nuleus surrounded by negatively charged electrons.
        
             
        
        
        
Gravitational forece can only attract whereas electomagatism can be attractive and repulsive
        
             
        
        
        
The answer is B frequency. When frequency increases more wave crests pass a fixed point each second. That means the wavelength shortens. So, as frequency increases, wavelength decreases
        
             
        
        
        
This question involves the concepts of Wein's displacement law and characteristic wavelength.
The blackbody temperature will be "3.22 x 10⁵ k".
<h3>WEIN'S DISPLACEMENT LAW</h3>
According to Wein's displacement law,

where,
 = characteristic wavelength = 9 μm = 9 x 10⁻⁹ m = characteristic wavelength = 9 μm = 9 x 10⁻⁹ m
- T = temperature = ?
- c = Wein's displacment constant = 2.897 x 10⁻³ m.k
Therefore,

T = 3.22 x 10⁵ k
Learn more about characteristic wavelength here:
brainly.com/question/14650107