Answer:
71 × 10^ -9 meters
Explanation:
From wave equation
Velocity = frequency × wavelength
Velocity of electronic radiation = 3× 10^8
Making the wavelength as the subject of formula, we have
Wavelength = Velocity / frequency
= 3×10^8 /4.21 × 10 ^15
0.71 × 10^-7
In nanometers
We have 0.71 ×10^2 × 10 ^-9
= 71 nanometers
