PHYSICS LABORATORY EXPERIMENTS >CUSTOM<
8th Edition
ISBN: 9781305751217
Author: Wilson
Publisher: CENGAGE C
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Chapter 3, Problem 1ASA
To determine
To define the least count of a measuring instrument and its relation to the number of significant figures of the measurement.
Expert Solution & Answer
Answer to Problem 1ASA
The smallest subdivision present on the measurement scale is defined as the least cunt of the measuring instrument. The direct reading from the instrument in addition with a fractional part of the least count smallest division constitute the total significant figures of the measured value.
Explanation of Solution
The least count of a measuring instrument is the smallest subdivision present on the measurement scale. The numbers that can be noted directly from the instrument scale plus one doubtful or estimated number–the fractional part of the least count smallest division.
The number of significant figures after the decimal point indicates the order of least count of the instrument. Less the number of decimal points after the reading, bigger will be the least count of the measurement.
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Lab-Based Section
Use the following information to answer the lab based scenario.
A student performed an experiment in an attempt to determine the index of refraction of glass.
The student used a laser and a protractor to measure a variety of angles of incidence and
refraction through a semi-circular glass prism. The design of the experiment and the student's
results are shown below.
Angle of
Incidence (°)
Angle of
Refraction (º)
20
11
30
19
40
26
50
31
60
36
70
38
2a) By hand (i.e., without using computer software), create a linear graph on graph paper
using the student's data. Note: You will have to manipulate the data in order to achieve a
linear function.
2b) Graphically determine the index of refraction of the semi-circular glass prism, rounding your
answer to the nearest hundredth.
Use the following information to answer the next two questions.
A laser is directed at a prism made of zircon (n = 1.92) at an incident angle of 35.0°, as shown in
the diagram.
3a) Determine the critical angle of zircon.
35.0°
70°
55
55°
3b) Determine the angle of refraction when the laser beam leaves the prism.
Chapter 3 Solutions
PHYSICS LABORATORY EXPERIMENTS >CUSTOM<
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