Question

what is the no of significant figyres in 4.5×10^8

Answer 1

Answer:

4.5 ×$10^{8}$ has 2 significant digits.

Solution:

Rules for significant figure are,

1. All non zero numbers are significant. Example: 425 has 3 significant digits.
2. Zero between two non zero number are significant. Example: 102 has 3 significant digits.
3. If the number has decimal than zeros at the end are significant. Example: 12.30 has 4 significant digits but 1230 has only 3 significant digits.
4. Zeros on the left of non zero number are not significant. Example: 0.023 has only two significant digits.

Thus,only 4 and 5 are significant digits.