Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
primary 6 | Science
2 Answers Below
Anyone can contribute an answer, even non-tutors.
Please help. Thanks
Date Posted: 4 years ago
Views: 418
See 2 Answers
Use method of elimination for the choices
A - No mention of timing of light bulbs X & Y
B - Same energy for X & Y. Purpose is to generate light with same amount of energy. Hence Y more energy efficient as more light energy produced.
C - same energy use. Light is wanted energy. Heat is unwanted energy. Hence X produce more unwanted energy than Y.
D - X generate more heat energy than Y
Ans : B, C, D.
A - No mention of timing of light bulbs X & Y
B - Same energy for X & Y. Purpose is to generate light with same amount of energy. Hence Y more energy efficient as more light energy produced.
C - same energy use. Light is wanted energy. Heat is unwanted energy. Hence X produce more unwanted energy than Y.
D - X generate more heat energy than Y
Ans : B, C, D.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Hi, I provide 1 to 1 tuition. $60/1.5h. I can cover English, Maths and Science. You may contact me via WhatsApp at 9033 8810. I am an ex-school teacher :)
Date Posted:
3 years ago
360 Tutoring Program