P7 - Practise Calculations

Practise exam calculations on P7 - Ocr 21st Century Board

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3. Calculate the powers of the following two lenses:
(a) focal length 2 m .........................................................
(b) focal length 10 cm .........................................................
3. A star A has a parallax of 0.20" and a star B has a parallax of 0.25". Which star is further
from the Earth?
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4. A star has a parallax of 0.2". What is its distance in parsecs?
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5. What are the distances of the following stars in parses?
(a) star A with a parallax 0.1" ............................................
(b) star B with a parallax of 0.05 " ............................................
(c) star C with a parallax of 0.01 " ............................................
6. Which two of the following distances are of similar size?
(a) parsec (b) kilometre (c) light year (d) astronomical unit (AU)
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7. Which of the following is more likely to be the distance of a star that is near to the Earth?
(a) 0.05 parsecs (b) 3 parsecs (c) 50 parsecs
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20. What is the distance of a galaxy that has a speed of recession of 1400 km/s.
Take the Hubble constant as 70 km/s per megaparsec.
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9. What is absolute zero in degrees Celsius? .............................................
10. (a) what is 100 oC on the absolute scale of temperature? ................................

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