Question

2. (a) An object which can be modelled as a blackbody is heated to different temperatures, represented by the four lines and their spectra are recorded in Figure 2. Intensity B A C 10- 8- 6- 4- 2- 0 0 1.0 2.0 3.0 Wavelength ? (?m) Figure 2 Based on Figure 2, (i) interpret sections A, B, and C as visible, ultraviolet and infrared wavelengths, respectively. (ii) explain why metal turns from red to white and gets brighter as it gets hotter. (30/100) (b) Betelgeuse is our nearest red giant star. It has a power output of $4.49 \times 10^{31}$ W and emits radiation with a peak wavelength of 850 nm. Determine the ratio of the radius of Betelgeuse, $r_b$ to the radius of the Sun, $r_s$. (30/100)

          2.
(a)
An object which can be modelled as a blackbody is heated to different
temperatures, represented by the four lines and their spectra are
recorded in Figure 2.
Intensity
B
A
C
10-
8-
6-
4-
2-
0
0
1.0
2.0
3.0
Wavelength ? (?m)
Figure 2
Based on Figure 2,
(i)
interpret sections A, B, and C as visible, ultraviolet and infrared
wavelengths, respectively.
(ii)
explain why metal turns from red to white and gets brighter as it
gets hotter.
(30/100)
(b) Betelgeuse is our nearest red giant star. It has a power output of
$4.49 \times 10^{31}$ W and emits radiation with a peak wavelength of 850 nm.
Determine the ratio of the radius of Betelgeuse, $r_b$ to the radius of the
Sun, $r_s$.
(30/100)

2.
(a)
An object which can be modelled as a blackbody is heated to different
temperatures, represented by the four lines and their spectra are
recorded in Figure 2.
Intensity
B
A
C
10-
8-
6-
4-
2-
0
0
1.0
2.0
3.0
Wavelength ? (?m)
Figure 2
Based on Figure 2,
(i)
interpret sections A, B, and C as visible, ultraviolet and infrared
wavelengths, respectively.
(ii)
explain why metal turns from red to white and gets brighter as it
gets hotter.
(30/100)
(b) Betelgeuse is our nearest red giant star. It has a power output of
4.49 × 10^31 W and emits radiation with a peak wavelength of 850 nm.
Determine the ratio of the radius of Betelgeuse, rb to the radius of the
Sun, rs.
(30/100)

Added by Sarah O.

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