Question

1. the only evidence astronomers have for the first stars that formed is the electromagnetic radiation they left behind. telescopes like hubble can detect objects billions of light - years away (billions of years back in time). the graph below shows some information about the first stars that formed after the big bang. radiation from the first stars key ---- emitted light of first stars —— redshifted light of first stars relative intensity wavelength ultraviolet radiation visible light infrared radiation (not drawn to scale) 300 million years after big bang 500 million years after big bang describe how wavelengths of emitted radiation from first stars have changed since the big bang and explain how this difference in wavelength is evidence for how the universe changed since the big bang. 1 difference in wavelength: how the universe changed: 6. explain how the wavelength and frequency of the sound waves change for the person when the ambulance is: a. approaching b. moving away

Explanation:

Step1: Analyze first - star radiation

The emitted radiation from first stars has redshifted. The wavelengths of the emitted radiation have increased. This is shown by the shift from the dashed - line (emitted light) to the solid - line (redshifted light) in the graph for radiation from the first stars.

Step2: Relate redshift to universe change

The redshift of light from first stars is evidence that the universe has expanded. As the universe expands, the space between the source (first stars) and the observer stretches, causing the wavelengths of the light to increase (redshift).

Step3: Analyze ambulance approaching

When the ambulance is approaching, the sound waves are compressed. According to the Doppler effect, the frequency of the sound waves increases and the wavelength decreases.

Step4: Analyze ambulance moving away

When the ambulance is moving away, the sound waves are stretched. According to the Doppler effect, the frequency of the sound waves decreases and the wavelength increases.

Answer:

5.
Difference in wavelength: The wavelengths of the emitted radiation from first stars have increased (redshifted).
How the universe changed: The universe has expanded, stretching the space between the first - stars and the observer, causing the light to redshift.
6.
a. Approaching: Frequency increases, wavelength decreases.
b. Moving away: Frequency decreases, wavelength increases.