Question

Calculate the frequency in Hz of orange colour light having wavelength 600 nm. [C = $3 \times 10^8$ ms$^{-1}$]

• A. $5.4 \times 10^{14}$ Hz
• B. $5.0 \times 10^{14}$ Hz
• C. $5.8 \times 10^{14}$ Hz
• D. $6.2 \times 10^{14}$ Hz

Hint:

Always convert wavelength to meters (m) before using the speed of light in m/s.

Answer 1

The Correct Option is B

Step 1: Formula
Frequency $\nu = \frac{c}{\lambda}$

Step 2: Conversion
$\lambda = 600$ nm = $600 \times 10^{-9}$ m = $6 \times 10^{-7}$ m.

Step 3: Calculation
$\nu = \frac{3 \times 10^8}{6 \times 10^{-7}} = 0.5 \times 10^{15} = 5.0 \times 10^{14}$ Hz.

Step 4: Conclusion
Hence, frequency is $5.0 \times 10^{14}$ Hz.
Final Answer: (B)