If the length of a wave is doubled, what will happen to the value of the frequency? (c = λv) A. it will increase B. it will decrease C. it will stay the same

B

Explanation:

If the frequency is doubled, the wavelength is only half as long.

If the wavelength Doubled, the frequency is reduced.

you need to give more information

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.