A red-dwarf candidate star emits radiation as electromagnetic waves.
Part of the electromagnetic spectrum is shown in the table below:
| Radio waves | Microwaves | [ 1 ] | Visible | [ 2 ] | [ 3 ] | Gamma-rays |
|---|
Complete the table by filling in the blanks [ 1 ], [ 2 ], and [ 3 ] with the correct electromagnetic waves in order of increasing frequency. Use the words from this list:
- infrared
- X-rays
- ultra-violet
Complete the sentence about electromagnetic waves in a vacuum: As the wavelength of an electromagnetic wave increases, its frequency __________ and its speed __________. Use the terms: decreases, increases, or stays the same.
The figure below shows how the intensity of the star's radiation changes with wavelength.
Use the figure to find the wavelength of the star's radiation at maximum intensity.
Wavelength = __________ μm\mu\text{m}μm
Some cosmic background radiation detected from deep space has a peak intensity at a wavelength of 1.8×10−3 m1.8 \times 10^{-3}\ \text{m}1.8×10−3 m. The table below shows the wavelength ranges of several bands of the electromagnetic spectrum:
| Electromagnetic band | Wavelength range (m) |
|---|---|
| Infrared | 7.5×10−77.5 \times 10^{-7}7.5×10−7 to 1.0×10−31.0 \times 10^{-3}1.0×10−3 |
| Microwaves | 1.0×10−31.0 \times 10^{-3}1.0×10−3 to 3.0×10−13.0 \times 10^{-1}3.0×10−1 |
| Radio waves | ≥3.0×10−1\ge 3.0 \times 10^{-1}≥3.0×10−1 |
Use the table to identify the electromagnetic band containing this peak intensity.
Which theory about the origin and evolution of the universe does this background radiation provide evidence for?