04. THE SPEED OF A TRAVELLING WAVES
WAVES (NCERT)

274456 The property of a medium necessary for wave propagation is

1 inertia
2 low resistance
3 elasticity
4 All of the above
WAVES (NCERT)

274457 The ratio of the speed of a body to the speed of sound is called

1 Mach number
2 Doppler ratio
3 sonic index
4 refractive index
WAVES (NCERT)

274458 A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 $\text{MHz}$. The speed of sound in a tissue is $1.7\text{km}/\text{s}$. The wavelength of sound in tissue is close to

1 $4\times {{10}^{-4}}\text{m}$
2 $4\times {{10}^{-3}}\text{m}$
3 $8\times {{10}^{-4}}\text{m}$
4 $8\times {{10}^{-3}}\text{m}$
WAVES (NCERT)

274459 When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' $x$ ' at time ' $t$ ' is given by :
$\begin{array}{*{35}{r}}
{} & {{y}_{1}}=0.05\text{cos}\left( 0.50\pi x-100\pi t \right) \\
{} & {{y}_{2}}=0.05\text{cos}\left( 0.46\pi x-92\pi t \right) \\
\end{array}$
where ${{y}_{1}},{{y}_{2}}$ and $x$ are in meters and $t$ in seconds. The speed of sound in the medium is :

1 $92\text{m}/\text{s}$
2 $200\text{m}/\text{s}$
3 $100\text{m}/\text{s}$
4 $332\text{m}/\text{s}$
WAVES (NCERT)

274460 At $t=0$, the shape of a travelling pulse is given by $y\left( x,0 \right)=\frac{4\times {{10}^{-3}}}{8-{{(x)}^{-2}}}$.
where $x$ and $y$ are in metres. The wave function for the travelling pulse if the velocity of propagation is $5\text{m}/\text{s}$ in the $x$ direction is given by

1 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}-5t \right)}$
2 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x-5t)}^{2}}}$
3 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x+5t)}^{2}}}$
4 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}+5t \right)}$
WAVES (NCERT)

274456 The property of a medium necessary for wave propagation is

1 inertia
2 low resistance
3 elasticity
4 All of the above
WAVES (NCERT)

274457 The ratio of the speed of a body to the speed of sound is called

1 Mach number
2 Doppler ratio
3 sonic index
4 refractive index
WAVES (NCERT)

274458 A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 $\text{MHz}$. The speed of sound in a tissue is $1.7\text{km}/\text{s}$. The wavelength of sound in tissue is close to

1 $4\times {{10}^{-4}}\text{m}$
2 $4\times {{10}^{-3}}\text{m}$
3 $8\times {{10}^{-4}}\text{m}$
4 $8\times {{10}^{-3}}\text{m}$
WAVES (NCERT)

274459 When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' $x$ ' at time ' $t$ ' is given by :
$\begin{array}{*{35}{r}}
{} & {{y}_{1}}=0.05\text{cos}\left( 0.50\pi x-100\pi t \right) \\
{} & {{y}_{2}}=0.05\text{cos}\left( 0.46\pi x-92\pi t \right) \\
\end{array}$
where ${{y}_{1}},{{y}_{2}}$ and $x$ are in meters and $t$ in seconds. The speed of sound in the medium is :

1 $92\text{m}/\text{s}$
2 $200\text{m}/\text{s}$
3 $100\text{m}/\text{s}$
4 $332\text{m}/\text{s}$
WAVES (NCERT)

274460 At $t=0$, the shape of a travelling pulse is given by $y\left( x,0 \right)=\frac{4\times {{10}^{-3}}}{8-{{(x)}^{-2}}}$.
where $x$ and $y$ are in metres. The wave function for the travelling pulse if the velocity of propagation is $5\text{m}/\text{s}$ in the $x$ direction is given by

1 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}-5t \right)}$
2 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x-5t)}^{2}}}$
3 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x+5t)}^{2}}}$
4 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}+5t \right)}$
WAVES (NCERT)

274456 The property of a medium necessary for wave propagation is

1 inertia
2 low resistance
3 elasticity
4 All of the above
WAVES (NCERT)

274457 The ratio of the speed of a body to the speed of sound is called

1 Mach number
2 Doppler ratio
3 sonic index
4 refractive index
WAVES (NCERT)

274458 A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 $\text{MHz}$. The speed of sound in a tissue is $1.7\text{km}/\text{s}$. The wavelength of sound in tissue is close to

1 $4\times {{10}^{-4}}\text{m}$
2 $4\times {{10}^{-3}}\text{m}$
3 $8\times {{10}^{-4}}\text{m}$
4 $8\times {{10}^{-3}}\text{m}$
WAVES (NCERT)

274459 When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' $x$ ' at time ' $t$ ' is given by :
$\begin{array}{*{35}{r}}
{} & {{y}_{1}}=0.05\text{cos}\left( 0.50\pi x-100\pi t \right) \\
{} & {{y}_{2}}=0.05\text{cos}\left( 0.46\pi x-92\pi t \right) \\
\end{array}$
where ${{y}_{1}},{{y}_{2}}$ and $x$ are in meters and $t$ in seconds. The speed of sound in the medium is :

1 $92\text{m}/\text{s}$
2 $200\text{m}/\text{s}$
3 $100\text{m}/\text{s}$
4 $332\text{m}/\text{s}$
WAVES (NCERT)

274460 At $t=0$, the shape of a travelling pulse is given by $y\left( x,0 \right)=\frac{4\times {{10}^{-3}}}{8-{{(x)}^{-2}}}$.
where $x$ and $y$ are in metres. The wave function for the travelling pulse if the velocity of propagation is $5\text{m}/\text{s}$ in the $x$ direction is given by

1 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}-5t \right)}$
2 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x-5t)}^{2}}}$
3 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x+5t)}^{2}}}$
4 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}+5t \right)}$
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WAVES (NCERT)

274456 The property of a medium necessary for wave propagation is

1 inertia
2 low resistance
3 elasticity
4 All of the above
WAVES (NCERT)

274457 The ratio of the speed of a body to the speed of sound is called

1 Mach number
2 Doppler ratio
3 sonic index
4 refractive index
WAVES (NCERT)

274458 A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 $\text{MHz}$. The speed of sound in a tissue is $1.7\text{km}/\text{s}$. The wavelength of sound in tissue is close to

1 $4\times {{10}^{-4}}\text{m}$
2 $4\times {{10}^{-3}}\text{m}$
3 $8\times {{10}^{-4}}\text{m}$
4 $8\times {{10}^{-3}}\text{m}$
WAVES (NCERT)

274459 When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' $x$ ' at time ' $t$ ' is given by :
$\begin{array}{*{35}{r}}
{} & {{y}_{1}}=0.05\text{cos}\left( 0.50\pi x-100\pi t \right) \\
{} & {{y}_{2}}=0.05\text{cos}\left( 0.46\pi x-92\pi t \right) \\
\end{array}$
where ${{y}_{1}},{{y}_{2}}$ and $x$ are in meters and $t$ in seconds. The speed of sound in the medium is :

1 $92\text{m}/\text{s}$
2 $200\text{m}/\text{s}$
3 $100\text{m}/\text{s}$
4 $332\text{m}/\text{s}$
WAVES (NCERT)

274460 At $t=0$, the shape of a travelling pulse is given by $y\left( x,0 \right)=\frac{4\times {{10}^{-3}}}{8-{{(x)}^{-2}}}$.
where $x$ and $y$ are in metres. The wave function for the travelling pulse if the velocity of propagation is $5\text{m}/\text{s}$ in the $x$ direction is given by

1 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}-5t \right)}$
2 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x-5t)}^{2}}}$
3 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x+5t)}^{2}}}$
4 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}+5t \right)}$
WAVES (NCERT)

274456 The property of a medium necessary for wave propagation is

1 inertia
2 low resistance
3 elasticity
4 All of the above
WAVES (NCERT)

274457 The ratio of the speed of a body to the speed of sound is called

1 Mach number
2 Doppler ratio
3 sonic index
4 refractive index
WAVES (NCERT)

274458 A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 $\text{MHz}$. The speed of sound in a tissue is $1.7\text{km}/\text{s}$. The wavelength of sound in tissue is close to

1 $4\times {{10}^{-4}}\text{m}$
2 $4\times {{10}^{-3}}\text{m}$
3 $8\times {{10}^{-4}}\text{m}$
4 $8\times {{10}^{-3}}\text{m}$
WAVES (NCERT)

274459 When two sound waves travel in the same direction in a medium, the displacements of a particle located at ' $x$ ' at time ' $t$ ' is given by :
$\begin{array}{*{35}{r}}
{} & {{y}_{1}}=0.05\text{cos}\left( 0.50\pi x-100\pi t \right) \\
{} & {{y}_{2}}=0.05\text{cos}\left( 0.46\pi x-92\pi t \right) \\
\end{array}$
where ${{y}_{1}},{{y}_{2}}$ and $x$ are in meters and $t$ in seconds. The speed of sound in the medium is :

1 $92\text{m}/\text{s}$
2 $200\text{m}/\text{s}$
3 $100\text{m}/\text{s}$
4 $332\text{m}/\text{s}$
WAVES (NCERT)

274460 At $t=0$, the shape of a travelling pulse is given by $y\left( x,0 \right)=\frac{4\times {{10}^{-3}}}{8-{{(x)}^{-2}}}$.
where $x$ and $y$ are in metres. The wave function for the travelling pulse if the velocity of propagation is $5\text{m}/\text{s}$ in the $x$ direction is given by

1 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}-5t \right)}$
2 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x-5t)}^{2}}}$
3 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-{{(x+5t)}^{2}}}$
4 $y\left( x,t \right)=\frac{4\times {{10}^{-3}}}{8-\left( {{x}^{2}}+5t \right)}$