Question

The element Caesium was discovered in 1860 by Robert Bunsen and Gustav Kirchhoff, who found two bright blue lines in the spectrum of a substance isolated from a mineral water. One of the spectral lines of Caesium has a wavelength of 456 nm. What is its frequency?​

Answer 1

6.48×10^14hz

Step-by-step explanation:

1 nm= 1×10^-9 m

456nm= 4.56×10^-7m

frequency=speed of light÷wavelength

f=3.00×10^8m/s÷4.56×10^-7m

f=6.48×10^14hz