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3 years ago

13

A remole control for a televsion works by sending out electromagnetic waves Which of the folowing is the best descniption for th

e behavior of the waves?

1 answer:

Ray Of Light [21]3 years ago

8 0

The correct answer is: Transverse waves from the remote transmit through air, which are then absorbed by the television detector.

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.What type of energy includes both kinetic and potential energy?

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Answer:

mechanical energy

Explanation:

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2 years ago

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Thermal energy is measurement of what type of molecular energy? *

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Answer:

Kinetic energy!

Explanation:

It measures the average kinetic energy of the molecules of a substance in degrees Fahrenheit (F) or Celsius (C).

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2 years ago

Which statement is true of the rock cycle?

o-na [289]

Answer:

c

Explanation:

igneous, sedimentary, and metamorphic. igneous forms from molten rock cools and solidifides

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6) (a) Calculate the absorbance of the solution if its concentration is 0.0278 M and its molar extinction coefficient is 35.9 L/

Anvisha [2.4K]

Answer:

6) (a) 0.499; (b) 31.7 %

7) 0.15

Explanation:

6) (a) Absorbance

Beer's Law is

$A = \epsilon cl\\A = \text{35.9 L&\cdot$mol$^{-1}$cm$^{-1}$} $\times$ 0.0278 mol$\cdot$L$^{-1} \times $ 0.5 cm = \mathbf{0.499}$

(b) Percent transmission

$A = \log {\left (\dfrac{1}{T}}\right)}\\\\\%T = 100T\\\\T = \dfrac{\%T}{100}\\\\\dfrac{1}{T} = \dfrac{100 }{\%T}\\\\A = \log \left(\dfrac{100 }{\%T} \right ) = 2 - \log \%T\\\\0.499 = 2 - \log \%T\\\\\log \%T = 2 - 0.499 = 1.501\\\\\%T = 10^{1.501} = \mathbf{31.7}$

7) Absorbance

$A = \log \left (\dfrac{I_{0}}{I} \right ) = \log \left (\dfrac{I_{0}}{0.70I_{0}} \right ) = \log \left (\dfrac{1}{0.70} \right ) = -\log(0.70) = \mathbf{0.15}}$

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3 years ago

In a physical change, the _____ does not change.

Ksivusya [100]

Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.

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3 years ago