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miskamm [114]
3 years ago
7

Select the statement that correctly describes how light travels.. -Light cannot travel in a vacuum because it travels slower whe

n the light source is moving. . - Light cannot travel in a vacuum because the light source is stationary. . - The speed of light, traveling in a vacuum, will not change if the light source is moving. . - Light traveling in a vacuum changes speeds when the light source moves. .
Physics
2 answers:
Juli2301 [7.4K]3 years ago
6 0

<u>Answer</u>

The speed of light, traveling in a vacuum, will not change if the light source is moving.


<u>Explanation</u>

Light is in the list of electromagnetic spectrum. Electromagnetic waves do not require a material medium for propagation. This means that they can travel in vacuum and so is light.

The speed of light is always constant and it does not depend on the source. So the correct statement about light is;<em> the speed of light, traveling in a vacuum, will not change if the light source is moving.</em>

stepladder [879]3 years ago
5 0
"The speed of light, traveling in a vacuum, will not change if the light source is moving" is the statement among the following choices given in the question that <span>correctly describes how light travels. The correct option among all the options that are given in the question is the third option or the penultimate option.</span>
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If a sound is 30 dB and its absolute pressure was 66 x 10-9 Pa, what must have been the reference pressure?
Ksenya-84 [330]

Given:

I = 30dB

P = 66 × 10^{-9} Pa

Solution:

Formula used:

I = 20\log_{10}(\frac{P}{P_{o}})           (1)

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P = absolute pressure

P_{o} = reference pressure

Using Eqn (1), we get:

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Read 2 more answers
A 2.64-kg copper part, initially at 400 K, is plunged into a tank containing 4 kg of liquid water, initially at 300 K. The coppe
marin [14]

Answer:

a) T_f=305.7049\ K

b) \Delta S=313.51\ J.K^{-1}

Explanation:

Given:

  • mass of copper, m_c=2.64\ kg
  • initial temperature of copper, T_{ic}=400\ K
  • specific heat capacity of copper, c_c=385\ J.kg^{-1}.K^{-1}
  • mass of water, m_w=4\ kg
  • initial temperature of water, T_{iw}=300\ K
  • specific heat capacity of water, c_w=4200\ J.kg^{-1}.K^{-1}

a)

<u>∵No heat is lost in the environment and the heat is transferred only between the two bodies:</u>

Heat rejected by the copper = heat absorbed by the water

2.64\times 385\times (400-T_f)= 4\times 4200\times (T_f-300)

T_f=305.7049\ K

b)

<u>Now the amount of heat transfer:</u>

Q=m_c.c_c.(T_{ic}-T_{f})

Q=2.64\times 385\times (400-305.7049)

Q=95841.5841\ J

∴Entropy change

\Delta S=\frac{dQ}{T}

\Delta S=\frac{95841.5841}{305.7049}

\Delta S=313.51\ J.K^{-1}

5 0
4 years ago
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