Calculate the frequency of red light of wavelength

[looi76]

Homework Statement

The speed of light is 3 \times 10^8 ms^{-1}. Calculate the frequency of red light of wavelength 6.5 \times 10^{-7} m.

Homework Equations

v = f\lambda
f = \frac{v}{\lambda}

The Attempt at a Solution

v = 3 \times 10^8 \ ms^{-1}
\lambda = 6.5 \times 10^{-7} \ m

f = \frac{3 \times 10^8 }{6.5 \times 10^{-7} }

f = 4.6 \times 10^{14} Hz
f = 450 THz

Is my answer correct?

 

[Antenna Guy]

f = 4.6 \times 10^{14} Hz
f = 450 THz

Is my answer correct?

Everything looked fine until 4.6 \times 10^{14} became 450 \times 10^{12}.

Regards,

Bill