Digital ACT Science Practice Question #1273
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Shorter observed wavelength = Blue = Moving toward us. Longer observed wavelength = Red = Moving away from us.
Compare observed wavelength $\lambda_{\text{obs}} = 654.1 nm$ with rest wavelength $\lambda_0 = 656.3 nm$: $\lambda_{\text{obs}} < \lambda_0$, meaning the wavelength has compressed (shifted toward the blue end of the spectrum). A blueshift ...
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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