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marshall27 [118]
3 years ago
6

You see lightning before you hear thunder because A) light waves can travel through a vacuum. B) sound waves cannot travel throu

gh the air. C) light waves travel faster than sound waves. D) sound waves travel faster than light waves 
i think its c
.
Physics
2 answers:
ss7ja [257]3 years ago
7 0

Yes the answer is most definetly C!!!

Alex Ar [27]3 years ago
3 0
C) light waves travel faster than sound waves

You were correct
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Which of the following is NOT usually published with a scientific report?
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C cost (I need points)

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How many joules of heat must be transferred to a 410-g aluminum pizza pan to raise its temperature from 32oC to 232oC? The speci
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Answer:

recall that heat absorbed released is given by

Q = mc*(T2 - T1)

where

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c = specific heat capacity (in J/g-k)

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The kinetic energy of a proton and that of an a-particle are 4 eV and 1 eV,
madam [21]

Answer:

  • <u><em>(b) 1:1</em></u>

Explanation:

<u></u>

<u>1. Formulae:</u>

  • E = hf  
  • E = h.v/λ
  • λ = h/(mv)
  • E = (1/2)mv²

Where:

  • E = kinetic energy of the particle
  • λ = de-Broglie wavelength
  • m = mass of the particle
  • v = speed of the particle
  • h = Planck constant

<u><em>2. Reasoning</em></u>

An alha particle contains 2 neutrons and 2 protons, thus its mass number is 4.

A proton has mass number 1.

Thus, the relative masses of an alpha particle and a proton are:

       \dfrac{m_\alpha}{m_p}=4

For the kinetic energies you find:

          \dfrac{E_\alpha}{E_p}=\dfrac{m_\alpha \times v_\alpha^2}{m_p\times v_p^2}

            \dfrac{1eV}{4eV}=\dfrac{4\times v_\alpha^2}{1\times v_p^2}\\\\\\\dfrac{v_p^2}{v_\alpha^2}=16\\\\\\\dfrac{v_p}{v_\alpha}=4

Thus:

           \dfrac{m_\alpha}{m_p}=4=\dfrac{v_p}{v__\alpha}

          m_\alpha v_\alpha=m_pv_p

From de-Broglie equation, λ = h/(mv)  

       \dfrac{\lambda_p}{\lambda_\alpha}=\dfrac{m_\lambda v_\lambda}{m_pv_p}=\dfrac{1}{1}=1:1

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A 2,500 kg car moves at 15 m/s^2; 15m/s^2 is the (blank) of the car.
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A. Acceleration.
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