MODERN PHYSICS LAB
MODERN PHYSICS LAB PHYS 2207
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This 2 page Class Notes was uploaded by Alverta Blick III on Tuesday October 13, 2015. The Class Notes belongs to PHYS 2207 at Louisiana State University taught by Staff in Fall. Since its upload, it has received 9 views. For similar materials see /class/223003/phys-2207-louisiana-state-university in Physics 2 at Louisiana State University.
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Date Created: 10/13/15
1 P71 m 40 5 I I gaugyumlmmummm 9mm cummu Wm we cum 5 51 many m 4351 mewu u M On mu mm spenumn lam 4mmeImenulylmclmulmm mum mm mlu gammy dnlgnmian 1m mummm W usca THE VERNIER CALIPER NOTE The scale on gures below is about 3 times larger than on the actual caliper 0 2 4 6 8 10 lllllllllllllllllll I ltagt 111111111 1 lllllllll lllllllll llll 0 1 2 3 cm 19 The vernier caliper reading 000 cm A space of the vernier scale is mm 095 mm 0 2 4 6 8 10 cm 100 Illllllllllllllllllll lllllllll lllllllll lllllllll llll 0 i 1 2 3 cm The third mark on the vernier scale after the zero mark or index is aligned with the third mark on the main scale the upper scale that has marks every 1 mm and the numbers are after 10 marks7 in units of centimeters 19 The vernier caliper reading 0300 cm 3 X mm 300 mm 3 gtlt 095 mm 015 mm 0015 cm 0 2 4 6 8 10 100 Illllllllllllllllllll lllllllllllllllll lllllllll llll 0 1 2 3 cm The twelfth mark on the vernier scale marked by number 6 is aligned with the 26 mark on the main scale the upper scale that has marks every 1 mm and the numbers are after 10 marks7 in units of centimeters 19 The vernier caliper reading 2600 cm 12 X mm 2600 mm 12 gtlt 095 mm 1460 mm 1460 cm Therefore7 read the lesser of the two marks on the main scale when the index is between marks in centimeters like 14 cm above representing the rst two digits of the measured value and add to that value the vernier reading like 060 mm 0060 cm above representing next two digits of the measured value The instrumental uncertainty is half of the smallest precisely measured value The smallest value precisely measured is when the rst ticks on both scales coincide7 which is 1 mm 7 mm 005 mm Therefore7 the instrumental uncertainty for this caliper is 0025 m 003 mm The two readings should be reported as 015 i 003 mm and 1460 i 003 mm
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