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Gre4nikov [31]
3 years ago
7

One brand of dog whistles claims a frequency of 25 kHz for its product. What is the wavelength of this sound? (the speed of soun

d in air is 343 m/s)
0.01372 m
0.02181 m
0.01748 m
0.011654 m
Physics
1 answer:
Alex787 [66]3 years ago
4 0

Answer:

Option A

0.01372 m

Explanation:

The speed of sound is a product of the wavelength and frequency hence

Speed=Wavelength * Frequency

Making wavelength the subject then

Wavelength=\frac {speed}{frequency}

Substituting 343 m/s for speed and 25 kHz= 25000 Hz for frequency we obtain

Wavelength=\frac {343}{25000}=0.01372 m

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The maximum Compton shift in wavelength occurs when a photon isscattered through 180^\circ .
vlabodo [156]

Answer: 90\°

Explanation:

The Compton Shift \Delta \lambda in wavelength when the photons are scattered is given by the following equation:

\Delta \lambda=\lambda_{c}(1-cos\theta)     (1)

Where:

\lambda_{c}=2.43(10)^{-12} m is a constant whose value is given by \frac{h}{m_{e}c}, being h the Planck constant, m_{e} the mass of the electron and c the speed of light in vacuum.

\theta) the angle between incident phhoton and the scatered photon.

We are told the maximum Compton shift in wavelength occurs when a photon isscattered through 180\°:

\Delta \lambda_{max}=\lambda_{c}(1-cos(180\°))     (2)

\Delta \lambda_{max}=\lambda_{c}(1-(-1))    

\Delta \lambda_{max}=2\lambda_{c}     (3)

Now, let's find the angle that will produce a fourth of this maximum value found in (3):

\frac{1}{4}\Delta \lambda_{max}=\frac{1}{4}2\lambda_{c}(1-cos\theta)      (4)

\frac{1}{4}\Delta \lambda_{max}=\frac{1}{2}\lambda_{c}(1-cos\theta)      (5)

If we want \frac{1}{4}\Delta \lambda_{max}=\frac{1}{2}\lambda_{c}, 1-cos\theta   must be equal to 1:

1-cos\theta=1   (6)

Finding \theta:

1-1=cos\theta

0=cos\theta  

\theta=cos^{-1} (0)  

Finally:

\theta=90\°    This is the scattering angle that will produce \frac{1}{4}\Delta \lambda_{max}      

7 0
3 years ago
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kirza4 [7]
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The anwser is A or D
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A 6- F capacitor is charged to 90 V and is then connected across a 700- resistor. What is the initial charge on the capacitor
Lorico [155]

Answer:

540C.

Explanation:

A capacitor of capacitance C when charged to a voltage of V will have a charge Q given as follows;

Q = CV          ----------(i)

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Substitute these values into equation (i) as follows;

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as the surface  area increases the rate of reaction  also increases.

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