PHYSICS HIGH SCHOOL

The frequency of wave A is 250 hertz and the wavelength is 30 centimeters. The frequency of wave B is260 hertz and the wavelength is 25 centimeters. Which is the faster wave?

Answers

Answer 1

Answer:

Wave A will be faster than the wave B because $V_A > V_B$

What is the frequency of the wave?

The frequency of the wave is defined as the cycle completed by the wave per second.

Now it is given in the question:

Frequency of wave A = 250 hertz

The wavelength of wave A= 30 cm

Frequency of wave B = 260 hertz

The wavelength of wave B= 25 cm

Now for finding which wave is faster we will calculate the velocity of the wave.

For Wave A

$V_A=f*\lambda=250* 30=7500\ (cm)/(s)$

For wave B

$V_B=f*\lambda=260* 25=6500\ (cm)/(s)$

We can see that the velocity of wave A is higher than the velocity of wave B.

Thus wave A will be faster than the wave B because $V_A > V_B$

To know more about the frequency of waves follow

brainly.com/question/12215474

Answer 2

Answer: Use the equation v=fλ
Wave A
250×30×10^-2=75 m/s
Wave B
260×25×10^-2=65 m/s

Therefore
Wave A is faster

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Answers

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When the engineer first sees the car, the locomotive is 100m from the crossing and its speed is 30m/s. If the engineer reaction time is 0.47 s what should the magnitude of the minimum deceleration to avoid an accident?

Answers

Answer:

The deceleration must have the engineer to avoid the accident is

a=-5.238 $(m)/(s^(2) )$

Explanation:

$x_(0)=100m\nv_(0)=30 (m)/(s) \nt=0.47 s$

While the engineer reacts the train continue moving so

$x_(f) = v*t= 30(m)/(s) *0.47s= 14.1 m$

$x_(t)= x_(o)+x_(f)\nx_(t)= 100m-14.1m=85.9m$

Now the final velocity have to be zero so using equation can find deceleration

$V_(f) ^(2) =V_(o) ^(2)+2*a*x_(f)\n 0= V_(o) ^(2)+2*a*x_(f)\na=-(V_(o) )/(2*x_(f))\na=-((30(m)/(s)) ^(2) )/(2*85.9m) \na=-5.238 (m )/(s^(2) ) } \n$

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Answers

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Answers

The moon influences the Earth's tides.

None of the items on this list of choices influences the seasons.

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A material that transmits nearly all the light in a ray because it offers little resistance to the light is A. translucent.
B. opaque.
C. fluorescent.
D. transparent.

Answers

Answer

D. transparent.

Explanation.

Materials can be classified into three in relation to how light pass through them.

Translucent. These are materials that allow light to pass through them but you can not see through them. A good example of this material is the glass that is used to make doors of a bathroom.

Opaque. These are material that cannot at all allow light to go through them. Examples are; Thick metals, concrete, wood and many others.

Transparent. Theses are materials that allow light to go through them and also you can see through them. A good example is the windscreen of a car.

With this information the correct answer is D. transparent.

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Answers

The second and third laws of thermodynamics states that absolute zero cannot be reached. The correct option among all the options that are given in the question is the third option or option "C". Both the laws actually deal with the relations that exist between heat and other forms of energy. I hope the answer helps you.

Answer:

D. the third law of thermodynamics

Explanation:

As per third law of thermodynamics we know that entropy of a perfect crystal comes to zero when the temperature of the crystal reaches to absolute zero.

So as per the theory of entropy we know that entropy of a system cannot be zero as it will reach zero then system will not exist.

So here we can say that

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