(C) centigrade DVN
2. Answer the following questions.
Star A is farther than star B. Which star
will have a large parallax angle?
ii) What are the dimensions of the quantity
wg. I being the length and g the
acceleration due to gravity?
iii) Define absolute error, mean absolute
error, relative error and mean percentage
error
iv
Describe what is meant by significant
figures and order of magnitude
Answers
Answer:
A parsec, about 3.26 light-years, is the distance where a star appears to shift by one second of arc as the Earth moves from one point in its orbit to the opposite point. This shift due to our changing of vantage point is one second of parallax. If a star is farther away, the parallax will be less; it varies inversely with distance. Thus if the star is 10 parsecs or 32.6 light years away, we see a parallax of 1/10 or 0.1 second. For 0.005 secobd that distance would be
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Answer:
i) Star B have large parallax angle as it is relatively close to earth than star A. Explanation: The objects closer to the earth have large parallax angle as compared to the object which is farther away.
ii) dimension of length , l = [L] dimension of acceleration due to gravity, g = [LT-²]
iii) Absolute error is defined as the magnitude of difference between the actual and the individual values of any quantity in question. Percentage Error is the relative error measured in percentage. So. Percentage Error =mean absolute value/mean value X 100= Δamean/amX100.
iv) Significant figures are the actual values that we use to answer. ... Also, we count the digits of the number starting from first non-zero digit , in the case of significant figures. Order of magnitude, on the other hand, is an exponential change in the power of 10 in the value of a quantity.