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GuDViN [60]
3 years ago
8

An EM wave has a speed of 3 x 10 ^ 8 m/s and a wavelength of 6 x 10 ^ -7 m. What is the frequency of the wave? 90 Hz 180 Hz 2 x

10 ^ -15 Hz 5 x 10 ^ 14 Hz
Physics
1 answer:
arsen [322]3 years ago
5 0
F = 3x10^8m/s / 6x10^-7m = Hz
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An electroscope is a simple device consisting of a metal ball that is attached by a conductor to two thin leaves of metal foil p
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Answer:

the electroscope separate  by the presence of charge carriers

Explanation:

Metal bodies are characterized by having free (mobile) electrons. In the electroscope the plates are in balance; when the external metal ball is touched, a charge is introduced into the device, when the body that touched the ball is separated, an excess charge remains. This charge, being a metal, is distributed over the entire surface, giving a uniform density and an electric force of repulsion is created between the two charged sheets, which tends to separate the sheets. This force is counteracted by the tension component as the sheets are separated at a given angle, the separation reaches the point where

                  Fe - Tx = 0

                  Fe = Tx

In summary, the electroscope separate its leaves by the presence of charge carriers

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3 years ago
What is the most power in watts the ear can receive before the listener feels pain?
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The softest sound a human ear can hear is at 0dB. Sounds above 130dB causes pain.
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2 years ago
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4 0
2 years ago
You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive
Irina-Kira [14]

Answer:

Explanation:

In the first case you can use the expression for the Doppler effect when the source is getting closer and getting away

f'=f(\frac{v}{v-v_{s}})    (  1  )

f''=f(\frac{v}{v+v_s})   (  2 )

f' = perceived frequency when the source is getting closer

f'' = perceived frequency when the source is getting away

f = source frequency

v = relative speed

vs = sound speed

by dividing (1) and (2) you have

\frac{f'}{f''}=\frac{f}{f}\frac{\frac{v}{v-v_s}}{\frac{v}{v+v_s}}=\frac{v+v_s}{v-v_s}\\\\f'v-f'v_s=f''v+f''v_s\\\\v(f'-f'')=v_s(f''+f')\\\\v=v_s\frac{f''+f'}{f'-f''}=(340\frac{m}{s})\frac{1370Hz+1330Hz}{1370Hz-1330Hz}=67.5\frac{m}{s}

but this is the relative velocity, you have that

v=v_{sir}-v_{car}\\v_{sir}=v+v_{car}=67.5\frac{m}{s}+35\frac{m}{s}=102.5\frac{m}{s}

a. hence, the speed of the police car is 102.5m/s

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3 years ago
Can oxygen bond to itself?
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