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Sound
Old people can not hear sounds even above
5,000 Hz
15,000 Hz
10,000 Hz
8,000 Hz
Author:
rikazzz
Comment
Everyday Science
As compared to air, the speed of sound in liquids and solids is
lower
faster
equal
zero
Author:
rikazzz
Comment
Sound
For hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be
double to this distance
equal to this distance
half of this distance
one third to this distance
Author:
rikazzz
Comment
Sound
Humans can hear sound up to the highest frequency of 20,000 Hz. If the wavelength of sound in air at this frequency at a temperature of 20 ° would be
5.7×10
-2
3.7×10
-2
1.7×10
-2
2.7×10
-2
Author:
rikazzz
Comment
Sound
In a market, the intensity level of sound recorded is 80 dB, the intensity level of sound should be
10
-4
Wm
-2
10
-6
Wm
-2
10
-8
Wm
-2
10
-5
Wm
-2
Author:
rikazzz
Comment
Sound
A marine survey ship sends a sound wave to the seabed which receives an echo after 2.5 s. The speed of sound in seawater is 1200 ms
-1
. The depth of the sea is
1200 m
1500 m
750 m
1000 m
Author:
rikazzz
Comment
Sound
A safe level of noise depends on
level of noise and exposure to noise
area
pitch
frequency
Author:
rikazzz
Comment
Sound
If the speed of the sound wave is 340ms
-1
 and wavelength is 0.5m then the frequency is
720Hz
680Hz
10Hz
240Hz
Author:
rikazzz
Comment
Sound
SONAR ranging is also used to see the object’s
shape only
size only
width
shape and size
Author:
rikazzz
Comment
Sound
The range of the frequencies which a human ear can hear is called the
pitch of sound
loudness of sound
audible frequency range
quality of sound
Author:
rikazzz
Comment
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