First slide

Accuracy; precision of instruments and errors in measurements

Question

If $L = 2.5 \times 10^{4} a n d B = 3.9 \times 10^{5},$ then (B - L) is

Moderate

A

$1.4 \times 10^{4}$
B

$1.4 \times 10^{5}$
C

$3.6 \times 10^{4}$
D

$3.6 \times 10^{5}$

Solution

Given, $L = 2.5 \times 10^{4} = 25000,$
$B = 3.9 \times 10^{5} = 390000$
$∴$ L -B = 390000 -25000 = 365000
$= 3.65 \times 10^{5} = 3.6 \times 10^{5}$
(rounded to one place of decimal)

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