<em>As the person moves around the room, he will find several point where the sound is maximum and several point where there is no sound. It is due to constructive and destructive interference of sound.</em>
Explanation:
The two loudspeakers kept at a distance of from one another produce the sound. If the person moving in the room listens to the sound of only one loudspeaker at a time, the intensity of the sound will be higher when he is near the loudspeaker and it will decrease as the person will move away from it.
If both the loudspeakers are switched on, the sound waves from both the loudspeakers can be heard in the room. As the sound waves travel throughout the room, they interfere with one another.
The interference of the sound waves causes the constructive interference and destructive interference in the room. Due to this, there are points of constructive interference where the intensity of the sound is highest due to both speakers.
Whereas at the point of destructive interference, the intensity of the sound is minimum.
Thus, <em>As the person moves around the room, he will find several point where the sound is maximum and several point where there is no sound. It is due to constructive and destructive interference of sound.</em>
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Sound
Keywords:
Two loudspeakers, large classroom, loudness, intensity, constructive, destructive, interference, wander around, move farther.
Answer:
(a)0.0002778
(b)
Explanation:
(a) The minute hand has a period of 60 minutes ( or 60 * 60 = 3600 seconds) for 1 circle. Its frequency per second would be
1 / 3600 = 0.0002778
(b) The hour hand has a period of 24 hours ( or 24*60 * 60 = 86400
seconds) for 1 circle. Its frequency per second would be
Answer:
(a)Average velocity ,v =128.74 Km/hr
(b)Kinetic Energy , K=958546.875 Joule
(c)Distance, s=268.8m
(d)Acceleration, a= - 2.38
<u>Explanation</u>:
<u>Given</u>:
Distance travelled = 40 miles
Time taken = 30 minutes.
(A) The average velocity in kilometres/hour
Converting 40 miles into km ,
we know that,
1 mile = 1.60934
40 miles = 40 x 1.60934
so 40 miles = 64.3738 Km
similarly converting 30 minutes into hours
1 minute =
30 minute =
30 minute =
Now
Average velocity =
Substituting Values,
Average velocity =
Average velocity =
Average velocity =128.74 Km/hr
(B) If the car weighs 1.5 tons, what is its If the car weighs 1.5 tons, what is its kinetic energy in joules (Note: you will need to convert your velocity to m/s)? in joules (Note: you will need to convert your velocity to m/s)?
Converting 1.5 tons into kg we get
1 ton = 1000 kg
so 1.5 ton =1500 kg
converting velocity to m/s
=>35.75 m/s----------------------------------------------------------(1)
kinetic energy K=
Substituting the values,
K=
K=
K=
K=
K=958546.875 Joule---------------------------------------------(2)
(c)When the driver applies the brake, it takes 15 seconds to stop. How far does the car travel (in meters) while stopping
Lets use Distance formula,
Substituting the known values,
-------------------------------------(3)
(D) What is the average acceleration of the car (in m/s2) during braking?
Using the formula
v=u +at
re arranging the formula we get,
Substituting the values
a= - 2.38 ----------------------------------------(4)
Now substituting 4 in 3 we get
s=268.8m--------------------------------------------------------------(5)