Answer:
[tex]\large \boxed{\text{1.016 $\times 10^{15}$ Hz}}[/tex]
Explanation:
The formula relating the frequency (f) and wavelength (λ) is
fλ = c
1. Convert nanometres to metres
295 nm = 295 × 10⁻⁹ m
2. Calculate the frequency
[tex]\begin{array}{rcl}f \times 295 \times 10^{-9} \text{ m}& =& 2.998 \times 10^{8} \text{ m$\cdot$s$^{-1}$}\\\\f & = & \dfrac{2.998 \times 10^{8} \text{ m$\cdot$s$^{-1}$}}{295 \times 10^{-9}\text{ m}}\\\\& = &1.016 \times 10^{15}\text{ s}^{-1}\\& = &\large \boxed{\textbf{1.016 $\mathbf{\times 10^{15}}$ Hz}}\end{array}[/tex]
