CIE iGCSE Co-Ordinated Science P6.2.1 The Sun as a star Exam Style Questions Paper 3
Question
(a) The mass of the Sun is 1.97 × 1030 kg.
The average density of the Sun is 1410 kg / m3.
Calculate the volume of the Sun.
volume = ……………………………………………. m3
(b) The Sun is made of very hot gas.
(i) Suggest the main method of thermal energy transfer from the inside of the Sun to the surface of the Sun.
(ii) State the main method of energy transfer that occurs when infrared waves travel from
the Sun to the Earth through space.
(iii) Sound energy is produced by the Sun.
Explain why we are unable to hear this sound on Earth.
(c) (i) Fig. 12.1 shows an incomplete electromagnetic spectrum.
Write infrared radiation in its correct place.
(ii) State the electromagnetic radiation which has the highest frequency.
(iii) Explain why it takes the same time for infrared and visible light to travel from the Sun to
the Earth.
(d) Fig. 12.2 shows a sound wave.
(i) On Fig. 12.2, label the amplitude of the wave with a double-headed arrow (↔) or (↕) and the letter A.
(ii) On Fig. 12.2, label the wavelength of one wave with a double-headed arrow (↔) or (↕) and the letter W.
▶️Answer/Explanation
Ans : 12(a) volume = mass/density (in any form) or 1.97 × 1030 / 1410 ;
= 1.4 × 1027 (m3) ;
12(b)(i) convection ;
12(b)(ii) radiation ;
12(b)(iii) sound waves need a medium / cannot travel through a vacuum ;
12(c)(i) infrared to the right of visible light ;
12(c)(ii)gamma radiation ;
12(c)(iii) all electromagnetic waves / they travel at same speed ;
12(d)(i) amplitude correctly labelled ;
12(d)(ii) wavelength correctly labelled ;