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Test Index
Waves Part 1
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Section:
Physics
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© examsnet.com
Question : 33 of 100
Marks:
+1
,
-0
In a resonance tube experiment when the tube is filled with water up to height of
17.0
cm
17.0 \, \text{cm}
17.0
cm
frombottom, it resonates with a given tuning fork. When the water level is raised the nextresonance with the same tuning fork occurs at a height of
24.5
cm
.
24.5 \, \text{cm} .
24.5
cm
.
If the velocity of sound in air is
330
m/s
,
330 \, \text{m/s},
330
m/s
,
the tuning fork frequency is:
[5 Sep 2020 Shift 1]
1100
Hz
1100 \, \text{Hz}
1100
Hz
3300
Hz
3300 \, \text{Hz}
3300
Hz
2200
Hz
2200 \, \text{Hz}
2200
Hz
550
Hz
550 \, \text{Hz}
550
Hz
Validate
Solution:
⇒
λ
=
2
(
l
2
−
l
1
)
⇒
2
×
(
24.5
−
17
)
\Rightarrow \lambda = 2 (l_{2} - l_{1} ) \Rightarrow 2 \times (24.5 - 17)
⇒
λ
=
2
(
l
2
−
l
1
)
⇒
2
×
(
24.5
−
17
)
⇒
2
×
7.5
=
15
cm
\Rightarrow 2 \times 7.5 = 15 \, \text{cm}
⇒
2
×
7.5
=
15
cm
&
v
=
f
λ
⇒
330
=
λ
×
15
×
1
0
−
2
\& v = f \lambda \Rightarrow 330 = \lambda \times 15 \times 10^{-2}
&
v
=
f
λ
⇒
330
=
λ
×
15
×
1
0
−
2
λ
=
330
15
×
100
\lambda = \frac{330}{15} \times 100
λ
=
15
330
×
100
⇒
1100
×
100
5
\Rightarrow \frac{1100 \times 100}{5}
⇒
5
1100
×
100
⇒
2200
Hz
\Rightarrow 2200 \, \text{Hz}
⇒
2200
Hz
© examsnet.com
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