What is the frequency of light for which the wavelength is 7.1 × 102 nm?

2.4 × 10 −6 s −1

2.1 × 102 s −1

4.2 × 105 s −1

4.2 × 1014 s −1

4.2 × 10⁻¹⁴s⁻¹

Explanation:

Given parameters:

Wavelength of light = 7.1 x 10²nm

We simplify and express this value in metres(m) to give:

⇒7.1 x 10² x 10⁻⁹m = 7.1 x 10⁽⁻²⁺⁹⁾ m

= 7.1 x 10⁷m

The wavelength is 7.1 x 10⁷m

We use the formula V = fλ

We know that Velocity of light is 3 x 10⁸ms⁻¹

Making f, frequency the subject of the formula gives :

f = V/λ

f = 3 x 10⁸ms⁻¹ / 7.1 x 10⁷m

f = 4.2 x 10⁻¹⁴s⁻¹

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.  

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.