Calculating Frequency of Blue Light: Speed of Light & Wavelength Formula

Thread starter 3instein
Start date May 5, 2008
Tags

Frequency Light

Click For Summary

The speed of light is approximately 3 x 10^8 m/s, and blue light has a wavelength of about 450 nm, which converts to 450 x 10^-9 m. To calculate the frequency of blue light, the formula v = fλ is used. By rearranging the formula to f = v/λ, the frequency can be calculated as f = (3 x 10^8 m/s) / (450 x 10^-9 m). The final calculation yields a frequency of approximately 6.67 x 10^14 Hz for blue light.

May 5, 2008

3instein

Homework Statement

The speed of light is 3 x 10^8 m/s. Blue light has a wavelength of about 450nm (nm = 10^-9 m). Calculate the frequency of this light

Homework Equations

v=f\lambda

The Attempt at a Solution

3 x 10^8 = f x 450
f = \frac{3 times 10^8}{450}

Physics news on Phys.org

May 5, 2008

Chi Meson

Science Advisor

Homework Helper

nearly there. Convert that wavelength to meters.

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

View full post »