GCSE Physics Required Practical: Investigating Infra-red Radiation - Revision history

NRJC: /* Improving Precision */

2019-10-17T08:55:20Z

‎Improving Precision

NRJC at 11:35, 13 April 2019

2019-04-13T11:35:12Z

NRJC at 12:14, 5 April 2019

2019-04-05T12:14:22Z

NRJC: /* Improving Precision */

2019-03-25T09:33:57Z

‎Improving Precision

NRJC: /* Improving Accuracy */

2019-03-20T15:36:28Z

‎Improving Accuracy

NRJC: /* Improving Accuracy */

2019-03-20T15:35:47Z

‎Improving Accuracy

NRJC: /* Improving Accuracy */

2019-03-20T14:04:00Z

‎Improving Accuracy

NRJC: Created page with "==Key Stage 4== ===Meaning=== Investigate the relationship between the colour and reflectivity of a surface with the intensity of Infra-red emission. ===Exper..."

2019-03-20T14:03:07Z

Created page with "==Key Stage 4== ===Meaning=== Investigate the relationship between the colour and reflectivity of a surface with the intensity of Infra-red emission. ===Exper..."

New page

==Key Stage 4==
===Meaning===
Investigate the relationship between the [[colour]] and [[reflectivity]] of a surface with the intensity of [[Infra-red]] [[emission]].

===Experiment 1: Leslie Cube===
====Variables====
: [[Independent Variable]]: The [[colour]] and [[reflectivity]] of each surface on the [[Leslie Cube|Leslie cube]].
: [[Dependent Variable]]: The [[temperature]] [[measure]]d using an [[Infra-red Thermometer|infra-red thermometer]].
: [[Control Variable]]s: The [[Volume (Space)|volume]] of the [[water]] in the [[Leslie Cube|Leslie cube]]. The [[temperature]] of the [[water]]. The distance between the [[Infra-red Thermometer|infra-red thermometer]] and the [[Leslie Cube|Leslie cube]].

====Method====
{| class="wikitable"
|-
|[[File:RequiredPracticalLeslieCube1.png|center|200px]]
|[[File:RequiredPracticalLeslieCube2.png|center|200px]]
|[[File:RequiredPracticalLeslieCube3.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "3"|A [[diagram]] showing several sides of a [[Leslie Cube|Leslie cube]].
|}

#Pour hot [[water]] into the [[Leslie Cube|Leslie cube]] until it is full.
#Use a [[ruler]] to [[measure]] 10cm from one surface of the [[Leslie Cube|Leslie cube]].
#Use an [[Infra-red Thermometer|infra-red thermometer]] to [[measure]] the apparent [[temperature]] of the surface.
#Record the apparent [[temperature]] and the [[colour]]/[[reflectivity]] of the surface.
#Repeat for each of the 4 different surfaces of the [[Leslie Cube|Leslie cube]].

====Improving [[Accuracy]]====
: Complete the [[temperature]] [[reading]]s very quickly to reduce the reduction in [[temperature]] of the [[water]] in the [[Leslie Cube|Leslie cube]].
: Place the [[Leslie Cube|Leslie cube]] on a [[Heatproof Mat|heatproof mat]] to reduce the reduction in [[temperature]] of the [[water]] in the [[Leslie Cube|Leslie cube]].

====Improving [[Precision]]====
: Use an [[Infra-red Thermometer|infra-red thermometer]] with a greater [[resolution]].

===Experiment 1: Painted Cans===
====Variables====
: [[Independent Variable]]: The [[colour]] and [[reflectivity]] of each surface on the cans.
: [[Dependent Variable]]: The [[temperature]] change of the [[water]] after a given time.
: [[Control Variable]]s: The [[Volume (Space)|volume]] of the [[water]] in each can. The [[temperature]] of the [[water]] at the start of the [[experiment]]. The shape and size of the cans.

====Method====
{| class="wikitable"
|-
|[[File:RequiredPracticalIR1.png|center|600px]]
|-
| style="height:20px; width:200px; text-align:center;"|A [[diagram]] showing the cans used in this [[experiment]].
|}

#Set up the [[apparatus]] as shown in the [[diagram]].
#[[Measure]] 300ml of hot [[water]] (around 50°C) in a [[Measuring Cylinder]].
#Pour the hot [[water]] into one of the cans.
#Wait until the [[temperature]] falls to 40°C and then start the [[stopwatch]].
#Record the [[temperature]] of the [[water]] every 30 seconds for 5 minutes.
#Repeat steps 2-5 for each different [[colour]]/[[reflectivity]] of can.

====Improving [[Accuracy]]====
: Place the cans on a [[Heatproof Mat|heatproof mat]] to reduce the [[Thermal Energy Store|thermal energy]] lost to the table surface by [[Thermal Conduction|conduction]].
: Place a lid over the cans to reduce the [[Thermal Energy Store|thermal energy]] lost to the [[air]] by [[evaporation]].
: Complete the experiments with different cans simultaneously so that a change in the [[temperature]] of the [[laboratory]] does not affect the [[results]].

{| class="wikitable"
|-
|[[File:RequiredPracticalIR2.png|center|600px]]
|-
| style="height:20px; width:200px; text-align:center;"|A [[diagram]] including [[apparatus]] used improve the [[accuracy]] of an [[experiment]] to compare the effectiveness of different [[Thermal Insulator|thermal insulators]].
|}

====Improving [[Precision]]====
: Use a [[thermometer]] with a higher [[resolution]].
: Use a [[Data Logger|data logger]] rather than a [[thermometer]].

← Older revision		Revision as of 08:55, 17 October 2019
Line 68:		Line 68:

	====Improving [[Precision]]====		====Improving [[Precision]]====
−	: ~~Use a~~ [[~~thermometer~~]] ~~with a higher~~ [[~~resolution]].~~	+	: Ensure the same amount of [[water]] is added to the cans ([[Control Variable]]) for each repeat measurement to reduce the range of results.
−	~~: Use a [[Data Logger\|data logger]] rather than a [[thermometer~~]].

@@ Line 1: / Line 1: @@
 ==Key Stage 4==
 ===Meaning===
 Investigate the relationship between the [[colour]] and [[reflectivity]] of a surface with the intensity of [[Infra-red]] [[emission]].

@@ Line 57: / Line 57: @@
 : Place a lid over the cans to reduce the [[Thermal Energy Store|thermal energy]] lost to the [[air]] by [[evaporation]].
 : Complete the experiments with different cans simultaneously so that a change in the [[temperature]] of the [[laboratory]] does not affect the [[results]].
-: Place the [[Measuring Cylinder|measuring cylinder]] on a flat, level surface and read it from [[Eye Level|eye level]] to get an [[accurate]] reading of the [[Volume (Space)|volume]] of [[water]].
+: Place the [[Measuring Cylinder|measuring cylinder]] on a flat, level surface and read it from eye level to get an [[accurate]] reading of the [[Volume (Space)|volume]] of [[water]].
 {| class="wikitable"

@@ Line 30: / Line 30: @@
 ====Improving [[Precision]]====
-: Use an [[Infra-red Thermometer|infra-red thermometer]] with a greater [[resolution]].
+: Complete the [[repeats|repeat]] [[measurement]]s as quickly as possible to reduce the [[range]] in the [[results]].
 ===Experiment 1: Painted Cans===

@@ Line 27: / Line 27: @@
 ====Improving [[Accuracy]]====
 : Complete the [[temperature]] [[reading]]s very quickly to reduce the reduction in [[temperature]] of the [[water]] in the [[Leslie Cube|Leslie cube]].
-: Place the [[Leslie Cube|Leslie cube]] on a [[Heatproof Mat|heatproof mat]] to reduce the reduction in [[temperature]] of the [[water]] in the [[Leslie Cube|Leslie cube]].
+: Place the [[Leslie Cube|Leslie cube]] on a on a [[Heatproof Mat|heatproof mat]] to reduce the [[Thermal Energy Store|thermal energy]] lost to the table surface by [[Thermal Conduction|conduction]].
 ====Improving [[Precision]]====