The image above represents wavelength.

To compute for wavelength, three essential parameters are needed and these parameters are **Planck’s Constant (h), Mass (m)** and **Velocity (v).**

The formula for calculating wavelength:

λ = ^{h}⁄_{mv}

Where

λ = wavelength

h = Planck’s constant

m = mass

v = velocity

Let’s solve an example;

Find the wavelength when the planck’s constant is 6.62e-34, the mass is 21 and the velocity is 11.

This implies that;

h = Planck’s constant = 6.62e-34

m = mass = 21

v = velocity = 11

λ = ^{h}⁄_{mv}

λ = ^{6.62607004e-34}⁄_{(21)(11)}

λ = ^{6.62607004e-34}⁄_{(231)}

λ = 2.86e-36

Therefore, the **wavelength **is **2.86e-36 m.**

**Calculating the Mass when the Wavelength, the Planck’s Constant and the Velocity is Given.**

m = ^{h} / _{λv}

Where;

m = mass

λ = wavelength

h = Planck’s constant

v = velocity

Let’s solve an example;

Find the mass when the wavelength is 18, the planck’s constant is 6.626e-34 and the velocity is 6.

This implies that;

λ = wavelength = 18

h = Planck’s constant = 6.626e-34

v = velocity = 6

m = ^{h} / _{λv}

m = ^{18} / _{6.626e-34 x 6}

m = ^{18} / _{3.976e-33}

m = 4.53

Therefore, the **mass **is **4.53 m.**

**Calculating the Velocity when the Wavelength, the Planck’s Constant and the Mass is Given.**

v = ^{h} / _{λm}

Where;

v = velocity

λ = wavelength

h = Planck’s constant

m = mass

Let’s solve an example;

Find the velocity when the wavelength is 20, the planck’s constant is 10 and the mass is 4.

This implies that;

λ = wavelength = 20

h = Planck’s constant = 10

m = mass = 4

v = ^{h} / _{λm}

v = ^{20} / _{10 x 4}

v = ^{20} / _{40}

v = 0.5

Therefore, the **velocity **is **0.5.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the wavelength.

To get the answer and workings of the wavelength using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **for** NGN 2,000 **per** annum** to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Basic Chemistry **under **Chemistry****.**

Now, Click on **De Broglie’s Law**** **under **Basic Chemistry**

Now, Click on **Wavelength **under **De Broglie’s Law**

The screenshot below displays the page or activity to enter your values, to get the answer for the wavelength according to the respective parameters which is the **Planck’s Constant (h), Mass (m)** and **Velocity (v).**

Now, enter the value appropriately and accordingly for the parameter as required by the **Planck’s Constant (h)** is **6.626e-34**,** Mass (m) **is **21** and **Velocity (v)** is **11**.

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator**– The Calculator Encyclopedia solves for the wavelength and presents the formula, workings and steps too.