NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXI15:WAVES
354821
The loudness and pitch of a sound note depends on
1 intensity and frequency
2 frequency and number of harmonics
3 intensity and velocity
4 frequency and velocity.
Explanation:
Loudness depends on the intensity of sound and pitch of sound depends on its frequency.
KCET - 2006
PHXI15:WAVES
354822
A sound level \(I\) is greater by \(3.0103\;dB\) from another sound of intensity \(10nW\,c{m^{ - 2}}.\) The absolute value of intensity of sound level \(I\) in \(W{m^{ - 2}}\) is:
354823
Sound waves are emitted uniformly in all directions from a point source. The dependence of sound level \(\beta\) in decibels on the distance \(r\) can be expressed as ( \(a\) and \(b\) are positive constants)
1 \(\beta=a-b(\log r)^{2}\)
2 \(\beta=-b \log r^{2}\)
3 \(\beta=a-\dfrac{b}{r^{2}}\)
4 \(\beta=a-b \log r\)
Explanation:
\(\beta=10 \log _{10} \dfrac{I}{I_{0}}\) If \(P\) is power of sound source then \(\beta = 10{\log _{10}}\frac{{\left( {P/4\pi {r^2}} \right)}}{{{I_0}}}\,{\text{where }}\,{I_0} = {10^{ - 12}}w/{m^2}\) \(=10 \log _{10} \dfrac{P}{4 \pi r^{2} \cdot I_{0}}=10\left[\log P-\log \left(4 \pi I_{0} \cdot r^{2}\right)\right]\) \(\left.=10\left[\log P-\log 4 \pi I_{0}-2 \log r\right)\right]=a-b \log r\)
PHXI15:WAVES
354824
Two identical sounds \(S_{1}\) and \(S_{2}\) reach at a point \(O\) in phase. The resultant loudness at pont \(P\) is \(n\;dB\) higher than the loudness of \(S_{1}\). The value of \(n\) is:
1 4
2 2
3 6
4 5
Explanation:
Let \(a\) be the amplitude due to \(S_{1}\) and \(S_{2}\) individually. Loudness due to \(S_{1}=I_{1}=K a^{2}\) Loudness due to \(S_{1}+S_{2}=I=K(2 a)^{2}=4 I_{1}\) \(\begin{aligned}& \beta_{1}=10 \log \left(\dfrac{I}{I_{o}}\right) \\& \beta_{2}=10 \log \left(\dfrac{4 I}{I_{o}}\right) \\& n=\beta_{2}-\beta_{1}=10 \log _{10}(4)=6\end{aligned}\)
354821
The loudness and pitch of a sound note depends on
1 intensity and frequency
2 frequency and number of harmonics
3 intensity and velocity
4 frequency and velocity.
Explanation:
Loudness depends on the intensity of sound and pitch of sound depends on its frequency.
KCET - 2006
PHXI15:WAVES
354822
A sound level \(I\) is greater by \(3.0103\;dB\) from another sound of intensity \(10nW\,c{m^{ - 2}}.\) The absolute value of intensity of sound level \(I\) in \(W{m^{ - 2}}\) is:
354823
Sound waves are emitted uniformly in all directions from a point source. The dependence of sound level \(\beta\) in decibels on the distance \(r\) can be expressed as ( \(a\) and \(b\) are positive constants)
1 \(\beta=a-b(\log r)^{2}\)
2 \(\beta=-b \log r^{2}\)
3 \(\beta=a-\dfrac{b}{r^{2}}\)
4 \(\beta=a-b \log r\)
Explanation:
\(\beta=10 \log _{10} \dfrac{I}{I_{0}}\) If \(P\) is power of sound source then \(\beta = 10{\log _{10}}\frac{{\left( {P/4\pi {r^2}} \right)}}{{{I_0}}}\,{\text{where }}\,{I_0} = {10^{ - 12}}w/{m^2}\) \(=10 \log _{10} \dfrac{P}{4 \pi r^{2} \cdot I_{0}}=10\left[\log P-\log \left(4 \pi I_{0} \cdot r^{2}\right)\right]\) \(\left.=10\left[\log P-\log 4 \pi I_{0}-2 \log r\right)\right]=a-b \log r\)
PHXI15:WAVES
354824
Two identical sounds \(S_{1}\) and \(S_{2}\) reach at a point \(O\) in phase. The resultant loudness at pont \(P\) is \(n\;dB\) higher than the loudness of \(S_{1}\). The value of \(n\) is:
1 4
2 2
3 6
4 5
Explanation:
Let \(a\) be the amplitude due to \(S_{1}\) and \(S_{2}\) individually. Loudness due to \(S_{1}=I_{1}=K a^{2}\) Loudness due to \(S_{1}+S_{2}=I=K(2 a)^{2}=4 I_{1}\) \(\begin{aligned}& \beta_{1}=10 \log \left(\dfrac{I}{I_{o}}\right) \\& \beta_{2}=10 \log \left(\dfrac{4 I}{I_{o}}\right) \\& n=\beta_{2}-\beta_{1}=10 \log _{10}(4)=6\end{aligned}\)
354821
The loudness and pitch of a sound note depends on
1 intensity and frequency
2 frequency and number of harmonics
3 intensity and velocity
4 frequency and velocity.
Explanation:
Loudness depends on the intensity of sound and pitch of sound depends on its frequency.
KCET - 2006
PHXI15:WAVES
354822
A sound level \(I\) is greater by \(3.0103\;dB\) from another sound of intensity \(10nW\,c{m^{ - 2}}.\) The absolute value of intensity of sound level \(I\) in \(W{m^{ - 2}}\) is:
354823
Sound waves are emitted uniformly in all directions from a point source. The dependence of sound level \(\beta\) in decibels on the distance \(r\) can be expressed as ( \(a\) and \(b\) are positive constants)
1 \(\beta=a-b(\log r)^{2}\)
2 \(\beta=-b \log r^{2}\)
3 \(\beta=a-\dfrac{b}{r^{2}}\)
4 \(\beta=a-b \log r\)
Explanation:
\(\beta=10 \log _{10} \dfrac{I}{I_{0}}\) If \(P\) is power of sound source then \(\beta = 10{\log _{10}}\frac{{\left( {P/4\pi {r^2}} \right)}}{{{I_0}}}\,{\text{where }}\,{I_0} = {10^{ - 12}}w/{m^2}\) \(=10 \log _{10} \dfrac{P}{4 \pi r^{2} \cdot I_{0}}=10\left[\log P-\log \left(4 \pi I_{0} \cdot r^{2}\right)\right]\) \(\left.=10\left[\log P-\log 4 \pi I_{0}-2 \log r\right)\right]=a-b \log r\)
PHXI15:WAVES
354824
Two identical sounds \(S_{1}\) and \(S_{2}\) reach at a point \(O\) in phase. The resultant loudness at pont \(P\) is \(n\;dB\) higher than the loudness of \(S_{1}\). The value of \(n\) is:
1 4
2 2
3 6
4 5
Explanation:
Let \(a\) be the amplitude due to \(S_{1}\) and \(S_{2}\) individually. Loudness due to \(S_{1}=I_{1}=K a^{2}\) Loudness due to \(S_{1}+S_{2}=I=K(2 a)^{2}=4 I_{1}\) \(\begin{aligned}& \beta_{1}=10 \log \left(\dfrac{I}{I_{o}}\right) \\& \beta_{2}=10 \log \left(\dfrac{4 I}{I_{o}}\right) \\& n=\beta_{2}-\beta_{1}=10 \log _{10}(4)=6\end{aligned}\)
354821
The loudness and pitch of a sound note depends on
1 intensity and frequency
2 frequency and number of harmonics
3 intensity and velocity
4 frequency and velocity.
Explanation:
Loudness depends on the intensity of sound and pitch of sound depends on its frequency.
KCET - 2006
PHXI15:WAVES
354822
A sound level \(I\) is greater by \(3.0103\;dB\) from another sound of intensity \(10nW\,c{m^{ - 2}}.\) The absolute value of intensity of sound level \(I\) in \(W{m^{ - 2}}\) is:
354823
Sound waves are emitted uniformly in all directions from a point source. The dependence of sound level \(\beta\) in decibels on the distance \(r\) can be expressed as ( \(a\) and \(b\) are positive constants)
1 \(\beta=a-b(\log r)^{2}\)
2 \(\beta=-b \log r^{2}\)
3 \(\beta=a-\dfrac{b}{r^{2}}\)
4 \(\beta=a-b \log r\)
Explanation:
\(\beta=10 \log _{10} \dfrac{I}{I_{0}}\) If \(P\) is power of sound source then \(\beta = 10{\log _{10}}\frac{{\left( {P/4\pi {r^2}} \right)}}{{{I_0}}}\,{\text{where }}\,{I_0} = {10^{ - 12}}w/{m^2}\) \(=10 \log _{10} \dfrac{P}{4 \pi r^{2} \cdot I_{0}}=10\left[\log P-\log \left(4 \pi I_{0} \cdot r^{2}\right)\right]\) \(\left.=10\left[\log P-\log 4 \pi I_{0}-2 \log r\right)\right]=a-b \log r\)
PHXI15:WAVES
354824
Two identical sounds \(S_{1}\) and \(S_{2}\) reach at a point \(O\) in phase. The resultant loudness at pont \(P\) is \(n\;dB\) higher than the loudness of \(S_{1}\). The value of \(n\) is:
1 4
2 2
3 6
4 5
Explanation:
Let \(a\) be the amplitude due to \(S_{1}\) and \(S_{2}\) individually. Loudness due to \(S_{1}=I_{1}=K a^{2}\) Loudness due to \(S_{1}+S_{2}=I=K(2 a)^{2}=4 I_{1}\) \(\begin{aligned}& \beta_{1}=10 \log \left(\dfrac{I}{I_{o}}\right) \\& \beta_{2}=10 \log \left(\dfrac{4 I}{I_{o}}\right) \\& n=\beta_{2}-\beta_{1}=10 \log _{10}(4)=6\end{aligned}\)
