Answer:
i think that it is C. both
Explanation:
The correct answer for this question is that the most likely of the
answers is an object with 0 weight. Everything in our known universe has
mass, and whilst when we are on earth things cannot have zero weight
because of the force of gravity, that same could not be said if an
object that has previously had weight is put in an environment with zero
gravity.
Answer :
(a) The energy is, 
(b) The wavelength (in nm) is, 
Explanation :
The general formula for the wavelength of spectral line emitted by a hydrogen atom, when it makes a transition from 
shell to 
shell is,
![\frac{1}{\lambda}=R_H[\frac{1}{(n_1)^2}-\frac{1}{(n_2)^2}]](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%5Clambda%7D%3DR_H%5B%5Cfrac%7B1%7D%7B%28n_1%29%5E2%7D-%5Cfrac%7B1%7D%7B%28n_2%29%5E2%7D%5D)
where,
= wavelength
Rydberg's Constant = 
In this, 
and 
![\frac{1}{\lambda}=(1.097\times 10^7)\times [\frac{1}{(2)^2}-\frac{1}{(4)^2}]](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%5Clambda%7D%3D%281.097%5Ctimes%2010%5E7%29%5Ctimes%20%5B%5Cfrac%7B1%7D%7B%282%29%5E2%7D-%5Cfrac%7B1%7D%7B%284%29%5E2%7D%5D)
conversion used : 
Now we have to calculate the energy.
Formula used :
= Wavelength = 
E = energy = ?
c = speed of light = 
h = Planck's constant = 
Now put all the given values in the above formula, we get:
Therefore, the energy is
An element is a substance that can not be broken down in simpler substances by chemical means. A compound is a substance that contains two or more substances that are chemically combined in a definite and fixed proportion by mass. A mixture is a combination of two or more substances which are not chemically combined. Mouthwash is an example of homogeneous mixture.
1(False)
2(True)
3(False)
4(True)
5(True)
6(True)
