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Marina CMI [18]

3 years ago

7

Which statement best describes how private industry decides where to spend on research and development

1 answer:

WINSTONCH [101]3 years ago

4 0

You didnt put the statements

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What frequency is received by a person watching an oncoming ambulance moving at 110 km/h and emitting a steady 800-Hz sound from

Strike441 [17]

To develop this problem we will apply the concepts related to the Doppler effect. The frequency of sound perceive by observer changes from source emitting the sound. The frequency received by observer $f_{obs}$ is more than the frequency emitted by the source. The expression to find the frequency received by the person is,

$f_{obs} = f_s (\frac{v_w}{v_w-v_s})$

$f_s$ = Frequency of the source

$v_w$ = Speed of sound

$v_s$ = Speed of source

The velocity of the ambulance is

$v_s = 119km/h (\frac{1000m}{1km})(\frac{1h}{3600s})$

$v_s = 30.55m/s$

Replacing at the expression to frequency of observer we have,

$f_{obs} = 800Hz(\frac{345m/s}{345m/s-30.55m/s})$

$f_{obs} = 878Hz$

Therefore the frequency receive by observer is 878Hz

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3 years ago

Minchanka [31]

Answer:

C

Explanation:

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The device that is made up of many single slits that diffract light and form a diffraction pattern , is called

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Gọi là máy quang phổ kế

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Acid compounds contain a.Oxygen B. Ion c. Hydrogen

valentina_108 [34]

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What creates more pressure?

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It is C, gasses with less kinetic energy, i did this and i think i remember it was C

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