With what speed should a star move with respect to us so that the beam at wavelength 460.0 nm is observed at 460.8 nm.

Explanation

To find the speed at which a star should move with respect to us so that the beam at a wavelength of 460.0 nm is observed at 460.8 nm, we can use the Doppler effect formula for light. Here’s a step-by-step solution:

### Step 1: Understand the Problem
We need to determine the speed of a star (V_radial) based on the change in wavelength observed due to its motion. The observed wavelength (λ_observed) is 460.8 nm, and the actual wavelength (λ_actual) is 460.0 nm.

### Step 2: Calculate the Change in Wavelength (Δλ)
The change in wavelength (Δλ) can be calculated using the formula:
\[
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