Question

Using the Doppler Waves simulation set the unshifted wavelength of the light to 385 nm. Set the v/c slider to -0.017 and start the simulation, pausing after waves reach the far side of the screen. With the simulation paused use the distance indicator in the simulation to measure the distance between two successive crests along the dotted line to the right of the moving object. This distance is the apparent wavelength of the light Aa. ла nm v do-do Using the relationship Determine your measured v/c с do v/c (measured with slider at -0.017) - (record your answer to at least 2 significant figures) Now reset the simulation and set the v/c slider to -0.077 and repeat the steps above v/C (measured with slider at -0.077) = (record your answer to at least 2 significant figures) Submit Answer 5 question attempts remaining

Answer 1

a) The doppler shift simulation was run with wavelength 385 nm and v/c = -0.017

The value of wavelength obtained was

$\lambda_a$ = 378.505 nm

So,

$\frac{v}{c } = \frac{\lambda_a -\lambda_0}{\lambda_0} = (378.505-385)/385 = -0.0168$

b) v/c was set to -0.077

Then,

$\lambda_a$ = 356.394 nm

So,

$\frac{v}{c } = \frac{\lambda_a -\lambda_0}{\lambda_0} = (356.394-385)/385 = -0.0743$