Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
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Textbook Question
Chapter 15, Problem 1FTD
Why do your ears “pop” when you drive up a mountain?
Expert Solution & Answer
To determine
To explain: why do ears “pop” when drive up a mountain.
Answer to Problem 1FTD
At high altitude the atmospheric pressure is low compared to the internal pressure. In order to equalize the pressure in the ear popping occurs.
Explanation of Solution
At Normal height from the sea level the atmospheric pressure in normal and is balanced by the internal pressure. However, as the height increases the atmospheric pressure decreases and internal pressure remain same. In the ear of man has air filled portion behind the eardrum. There always air pressure equalization occurs.
At high altitude due to pressure difference Eustachian tube get blocked. When this happens ear popping occurs. Thus, ear popping is discomfort experienced by the ear due to the pressure difference.
Conclusion:
At high altitude the atmospheric pressure is low compared to the internal pressure. In order to equalize the pressure in the ear popping occurs.
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Two mirrors meet an angle, a, of 105°. A ray of light is incident upon mirror A at an angle, i, of
42°. The ray of light reflects off mirror B and then enters water, as shown below:
Incident
ray at A
Note: This diagram is not to
scale.
a
Air (n = 1.00)
Water (n = 1.34)
1) Determine the angle of refraction of the ray of light in the water.
B
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Chapter 15 Solutions
Essential University Physics (3rd Edition)
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