What is the wavelength in picometers for an electron moving at 1,495 km ?

Wavelength = 486.51 pm

Explanation:

The expression for the deBroglie wavelength is:

Where,  

is the deBroglie wavelength  

h is Plank's constant having value

m is the mass of electron having value

v is the speed of electron.

Given that v = 1495 km/s (Corrected from source)

Also, 1 km = 1000 m

So, v = 1495000 m/s

Applying in the equation as:

Also, 1 m = 10¹² pm

So, Wavelength = 486.51 pm

it means there are 3 atoms of oxygen

b) nuclear ive learned that in a pedtrodic table