PHY 131 EXAM 3 | QUESTIONS AND
ANSWERS | 2026 UPDATE | WITH
COMPLETE SOLUTIONS
The increase the temperature of 50 grams of water by 1 Celcius degree requires
1 calorie.
150 calories.
100 calories.
50 calories. - ANSWER>50 calories.
The food in a refrigerator is cooled by
vaporization of the refrigerating fluid.
none of these.
condensation of the refrigerating fluid. - ANSWER>vaporization of the refrigerating fluid.
Boiling water does not increase in temperature when additional heat is applied because
added input energy doesn't increase the water's internal energy.
,the increased heating produces increased boiling and therefore increased cooling.
none of these.
the temperature doesn't change in a change of state. - ANSWER>the increased heating produces increased boiling
and therefore increased cooling.
When a gas is changed to a liquid state, the gas
absorbs energy.
neither releases nor absorbs energy.
releases energy. - ANSWER>releases energy.
Evaporation is a cooling process and condensation is a
cooling process.
warming process.
neither a warming or cooling process. - ANSWER>warming process.
What is the frequency, in hertz, that corresponds to each of the following periods?
(a) 0.80 s
,(b) 7 s
(c) 1/100 s - ANSWER>a. 1.25
b. .14
c. 100
What is the period, in seconds, that corresponds to each of the following frequencies?
(a) 8 Hz
(b) 0.80 Hz
(c) 80 Hz - ANSWER>a. .125
b. 1.25
c. .0125
, A weight suspended from a spring is seen to bob up and down over a distance of 15 centimeters 3 times each
second.
What is its frequency?
What is its period?
What is its amplitude? - ANSWER>3, .333, 7.5
A skipper on a boat notices wave crests passing his anchor chain every 4 s. He estimates the distance between
wave crests to be 15 m. He also correctly estimates the speed of the waves. What is this speed? - ANSWER>3.75
On a keyboard, you strike a note, which has a frequency of 290 Hz.
(a) What is the period of one vibration of this tone?
(b) As the sound leaves the instrument at a speed of 340 m/s, what is its wavelength in air? - ANSWER>a. .0034
b. 1.156
ANSWERS | 2026 UPDATE | WITH
COMPLETE SOLUTIONS
The increase the temperature of 50 grams of water by 1 Celcius degree requires
1 calorie.
150 calories.
100 calories.
50 calories. - ANSWER>50 calories.
The food in a refrigerator is cooled by
vaporization of the refrigerating fluid.
none of these.
condensation of the refrigerating fluid. - ANSWER>vaporization of the refrigerating fluid.
Boiling water does not increase in temperature when additional heat is applied because
added input energy doesn't increase the water's internal energy.
,the increased heating produces increased boiling and therefore increased cooling.
none of these.
the temperature doesn't change in a change of state. - ANSWER>the increased heating produces increased boiling
and therefore increased cooling.
When a gas is changed to a liquid state, the gas
absorbs energy.
neither releases nor absorbs energy.
releases energy. - ANSWER>releases energy.
Evaporation is a cooling process and condensation is a
cooling process.
warming process.
neither a warming or cooling process. - ANSWER>warming process.
What is the frequency, in hertz, that corresponds to each of the following periods?
(a) 0.80 s
,(b) 7 s
(c) 1/100 s - ANSWER>a. 1.25
b. .14
c. 100
What is the period, in seconds, that corresponds to each of the following frequencies?
(a) 8 Hz
(b) 0.80 Hz
(c) 80 Hz - ANSWER>a. .125
b. 1.25
c. .0125
, A weight suspended from a spring is seen to bob up and down over a distance of 15 centimeters 3 times each
second.
What is its frequency?
What is its period?
What is its amplitude? - ANSWER>3, .333, 7.5
A skipper on a boat notices wave crests passing his anchor chain every 4 s. He estimates the distance between
wave crests to be 15 m. He also correctly estimates the speed of the waves. What is this speed? - ANSWER>3.75
On a keyboard, you strike a note, which has a frequency of 290 Hz.
(a) What is the period of one vibration of this tone?
(b) As the sound leaves the instrument at a speed of 340 m/s, what is its wavelength in air? - ANSWER>a. .0034
b. 1.156
