Question from a student 20160417c

Question

From: MMMMMMMM
Sent: Sunday, April 17, 2016 5:51 PM
Subject: 2015R2-FNSC3180 : Food Microbiology: Question about last year exam paper question B4

Dear Prof Kwan,

I am Chau Mei Ling from FNSC3180. I have seen the revised answer posted on blog. But I thought the answer should be 0.25mins* 10^-1.5. It is becasue that is a log scale. 1 log = 10^1, 2 log = 10^2. Then, is it 1.5 log = 10^1.5? Thanks a lot.


Answer

You are correct. But I accept approximation, so 1.5 log reduction can be calculated as reduction of 1.5*10 as approximation. The straight answer should be 0.25min/10^1.5 but I accept 0.25min/15 using approximation.

Best,

HS Kwan