1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Andrei [34K]
4 years ago
12

The siren on an ambulance is emitting a sound whose frequency is 2450 Hz. The speed of sound is 343 m/s. If the ambulance is sta

tionary and you (the "observer") are sitting in a parked car, what are the wavelength and the frequency of the sound you hear?
Physics
2 answers:
lyudmila [28]4 years ago
5 0

Answer:

The wavelength is 0.14 m

Explanation:

Given that,

Frequency = 2450 Hz

Speed of sound = 343 m/s

We need to calculate the wavelength

Using formula of wavelength

v=  f\lambda

Where, v = speed of sound

f = frequency

Put the value into the formula

\lambda=\dfrac{v}{f}

\lambda=\dfrac{343}{2450}

\lambda=0.14\ m

Hence,  The wavelength is 0.14 m

Anna11 [10]4 years ago
5 0

Explanation:

It is given that,

Frequency of the siren, f = 2450 Hz

The speed of sound, v = 343 m/s

Here, both ambulance and the observer is stationary. The observed frequency is calculated using Doppler's effect as :

f'=\dfrac{v+v_o}{v-v_s}\times f

v_o is the velocity of observer

v_s is the velocity of source

v is the speed of sound wave

Here, v_o=v_s=0

So, f' = f

f' = 2450 Hz

Wavelength, \lambda'=\dfrac{v}{f'}

\lambda'=\dfrac{343\ m/s}{2450\ Hz}

\lambda'=0.14\ m

So, the frequency and wavelength of the observed sound is 2450 Hz and 0.14 meters. Hence, this is the required solution.

You might be interested in
When a sound from a source is refracted away from the surface of the earth, it gives an indication that the
White raven [17]

Answer:

the answer is A. air is cooler than the ground.

Explanation:

7 0
4 years ago
Read 2 more answers
Viscosity: Blood is about 4 to 5 times ____________ viscous than water. Viscosity of blood depends upon the amount of dissolved
kherson [118]

Answer:more, increased

Explanation:

Blood is four to five times more viscous than water.

Viscosity depends upon dissolved substances in blood and it increases as the amount is increases or if the fluid in the blood decreases.

Viscosity is the resistance offered by liquid to the flow and it also depends upon temperature and it decreases with increase in temperature.      

8 0
3 years ago
A wall has inner and outer surface temperatures of 25◦C and 8◦C, respectively. The interior and exterior air temperatures are 35
Angelina_Jolie [31]

Answer:

a) \frac{\dot Q}{A} =60\ W.m^{-2}

b) \frac{\dot Q}{A} =110\ W.m^{-2}

c) The wall may not be under steady because the two surfaces of the wall are exposed to the air at different temperatures and they have different convective coefficient.

Explanation:

Given:

  • temperature of the inner surface of the wall, T_i=25^{\circ}C
  • temperature of the outer surface of the wall, T_o=8^{\circ}C
  • temperature of the air outside, T_{ao}=-3^{\circ}C
  • temperature of the air inside, T_{ai}=35^{\circ}C
  • coefficient of heat convection on outside, h_o=10\ W.m^{-2}.K^{-1}
  • coefficient of heat convection on inside, h_i=6\ W.m^{-2}.K^{-1}

a)

The heat flux between the interior air and the wall:

The convective heat transfer rate is given as,

Q=h_i.A.\Delta T

\Rightarrow \frac{\dot Q}{A} =h_i\times (T_{ai}-T_i)

\frac{\dot Q}{A} =6\times (35-25)

\frac{\dot Q}{A} =60\ W.m^{-2}

b)

The heat flux between the exterior air and the wall:

\Rightarrow \frac{\dot Q}{A} =h_o\times (T_{ao}-T_i)

\frac{\dot Q}{A}=10\times (8-(-3))

\frac{\dot Q}{A} =110\ W.m^{-2}

c)

The wall may not be under steady because the two surfaces of the wall are exposed to the air at different temperatures and they have different convective coefficient.

4 0
4 years ago
Bonus Points. A ball was thrown straight up in the air from 1.2 meter above the grouind. After 3 seconds the ball returnes to th
nekit [7.7K]

Answer:

Explanation:

given that

Distance above the ground, s = 1.2 m

Time taken by the ball, t = 3 s

Velocity of the ball, v = 1.2/3 = 0.4 m/s

Maximum height reached by the ball is then given by the formula

H = v² / 2g

H = 0.4² / 2 * 9.8

H = 0.16 / 19.6

H = 0.0082 m or rather, 0.82 cm

5 0
3 years ago
Often times we think about insulation, we think about keeping cold items cold, such as drinks in an ice chest or the cool temper
Burka [1]

Answer:

So, insulation essentially works by creating a sort of barrier between the hot and the cold object. This barrier helps to reduce heat transfer by either reflecting the thermal radiation or by decreasing thermal conduction and convection from one object to the other.

4 0
2 years ago
Other questions:
  • Questions 1 – 5 use the following word bank to place the correct letter in the space that correctly completes the sentence. A.PA
    15·1 answer
  • A 150 kg cart is being accelerated by a tractor at a rate of 5 m/s². How much force is the tractor putting on the cart?
    9·1 answer
  • What is the electric flux through a sphere that has a radius of 1.00 m and carries a charge of +4.00 µC at its center?
    12·1 answer
  • Identify the relationship between kinetic energy (KE) and gravitational potential energy (PE) for the cyclist at each position.
    12·1 answer
  • What allows the bimetallic coil to turn on or off a heating or cooling system? The two metals contract the same amount. The ther
    9·1 answer
  • A plane monochromatic radio wave (? = 0.3 m) travels in vacuum along the positive x-axis, with a time-averaged intensity I = 45.
    11·1 answer
  • A magnetic field is passing through a loop of wire whose area is 0.020 m2. The direction of the magnetic field is parallel to th
    11·1 answer
  • Read the (above) article from the Fremont Gazette and be sure to answer all THREE QUESTIONS that follow:
    11·1 answer
  • Two cars move at different velocities. Car A moves at a speed of 90 km/hr while Car B moves
    11·1 answer
  • Unit 2 Lesson 9: Temperature & Heat Unit Test does anyone have the answers
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!