Question

29. True or False 1M

a. Rocks can be of definite shape and size.

b. The radius of the earth is 6371km.​

Answer 1

Answer:

a. false

Explanation:

order of magnitude :- it is used scientific notation. if any number X in such a way that X = m × 10^n , where m belongs to \left[\frac{\sqrt{10}}{10},\sqrt{10}\right][

10

10

,

10

] then, 10ⁿ is known as order of magnitude.

here given, earth's radius 6371 km

it can be written as 6371000m

so, 6371 km = 6371000m

now, 6371000m = 0.6371 × 10^7 m

here you can see √10/10 ≤ 0.6371 ≤ √10

so, 10^7m is the order of magnitude.

hence, option (C) is correct.

Answer 2

Explanation:

1st false

2nd true

......

................