Science 30 January 2000 Diploma Examination
Science 30 January 2000 Diploma Examination Science 30 January 2000 Diploma Examination
12. Certain types of radio waves are used for communicating with spacecraft. Radio signals may be modified through amplitude modulation (AM) or through frequency modulation (FM). Which of the following diagrams represents a radio signal with a changing frequency A. B. C. D. Numerical Response 2. Mars has a mass of 6.42 × 10 23 kg. When a probe orbiting Mars is 3.52 × 10 6 m from the centre of the planet, the gravitational field strength of Mars acting upon the probe is _________N/kg. (Record your answer to three digits in the numerical-response section on the answer sheet.) 6
Use the following information to answer the next question. Field Graph Strength of field Distance Short Answer – 5% Electrical and gravitational fields have many properties in common. One such property is that the strength of these fields varies with distance. On the grid above, sketch the line that demonstrates the relationship between the strength of a field and distance, and, in a few sentences, describe this relationship. ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... ..................................................................................................................................................... 7
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Use the following information to answer the next question.<br />
Field Graph<br />
Strength of field<br />
Distance<br />
Short Answer – 5%<br />
Electrical and gravitational fields have many properties in common. One such<br />
property is that the strength of these fields varies with distance. On the grid above,<br />
sketch the line that demonstrates the relationship between the strength of a field and<br />
distance, and, in a few sentences, describe this relationship.<br />
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