Please give meaningful answers :-
3. The diameter of the Sun is 1.4 x 10'm whereas the diameter of the Earth is 1.2756 x 10 m. Compare the
diameter of the Sun, with the diameter of the Earth.
4. The size of a red blood cell is 0.000007 m and that of a plant cell is 0.00001275 m. What is the
approximate ratio of their sizes?
Answers
Answer:
3. Given that Diameter of the Sun is 1.4 x 109 meters and Earth is 1.2768 x 107 meters.
Ratio of diameters of the sun to that of earth is = 1.4 x 109 : 1.2768 x 107
= 1.4 x 102 : 1.2768
= 140 : 1.2768.
= 70 : 0.6384
= 35 : 0.3192 (multiply 10000 each term)
= 350000 : 3192
= 175000 : 1596
= 87500 : 798
= 43750 : 399.
4. The size red blood cells =0.000007m
The size of plant cell=0.00001275m
Ratio= 0.000007m/0.00001275m
=7/1000000×100000000/1275
=700/1257
=140/255
=28/51
Therefore the ratio is 28:51
Answer:
Diameter of the sun is 1.4×10
9
m
Diameter of the earth is 1.2756×10
7
m
Diameter of the earth
Diameter of the sun
=
1.2756×10
7
1.4×10
9
=100
⟹ Diameter of the sun =100×Diameter of the Earth
Given, the size of red blood cell = 0.000007 m = 7 * 10-6 m
and the size of plant cell = 0.00001275 m = 1.275 * 10-5 m
Now, the approximate ratio of their size = (7 * 10-6 )/(1.275 * 10-5 )
= (7 * 10-6+5 )/1.275 [am /an = am-n]
= (7 * 10-1 )/1.275
= (7 * 1/10)/1.275
= (7/10)/1.275
= 0.7/1.275
= 0.7/1.3 [1.275 ≈ 1.3]
= 7/13
= 1/2 [approx.]
So, the approximate ratio of their size = 1 : 2
4)