Answer
- A
- D
- D
- A
- B
- A
This is what I got, but i'm mot sure if I'm right
You're correct It's D :))))))))<span />
Answer:
The hydrogen spectrum is an important piece of evidence to show the quantized electronic structure of an atom. ... It results in the emission of electromagnetic radiation initiated by the energetically excited hydrogen atoms. The hydrogen emission spectrum comprises radiation of discrete frequencies.
The spectrum starts with red light, with a wavelength of 700 nanometers (7,000 angstroms), at the top. ... It spans the range of visible light colours, including orange and yellow and green, and ends at the bottom with blue and violet colours with a wavelength of 400 nm (4,000 angstroms).
Explanation:
Hydrogen molecules are first broken up into hydrogen atoms (hence the atomic hydrogen emission spectrum) and electrons are then promoted into higher energy levels. Suppose a particular electron is excited into the third energy level. It would tend to lose energy again by falling back down to a lower level.
The spectrum of the Sun appears as a continuous spectrum and is frequently represented as shown below. This type of spectrum is called an emission spectrum because what you are seeing is the direct radiation emitted by the source.
Answer: a) The density of the jewelry will be 
b) The element is silver.
Explanation:
Density is defined as the mass contained per unit volume.
Given : Mass of jewelry = 132.6 grams
Volume of jewelry = volume of water displaced = 
Putting in the values we get:
Thus density of the jewelry will be 
As density is characteristic of a particular material , the material must be silver which has a density of 10.5 g/ml.
