Proportional and Inversely Proportional Sequences
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Questions and Answers

In direct proportionality, if the independent variable x is not equal to 0, how can the proportionality constant k be expressed?

  • $k = y \times x$
  • $k = \frac{y}{x}$ (correct)
  • $k = y - x$
  • $k = \frac{x}{y}

    • What does it mean for two variables to be directly proportional?

  • The difference of the two variables is constant.
  • The sum of the two variables is constant.
  • The ratio of the two variables is constant. (correct)
  • The product of the two variables is constant.

    • How can direct proportionality be represented using symbols?

  • $y < x$
  • $y \propto x$ or $y \sim x$ (correct)
  • $y > x$
  • $y = x$

    • In a linear equation representing direct proportionality, what are the characteristics of the equation?

    <p>A y-intercept of 0 and a slope of k</p> Signup and view all the answers

    What is another name for the proportionality constant in direct proportionality?

    <p>Constant of proportionality</p> Signup and view all the answers

    What is the speed of light in vacuum, a fundamental constant of nature?

    <p>299792458 m/s</p> Signup and view all the answers

    What is the range of wavelengths for visible light, as defined in the text?

    <p>400–700 nanometres (nm)</p> Signup and view all the answers

    What are the primary properties of light mentioned in the text?

    <p>Intensity, propagation direction, frequency or wavelength spectrum, and polarization</p> Signup and view all the answers

    What represents the quanta of electromagnetic field and can be analyzed as both waves and particles?

    <p>Photons</p> Signup and view all the answers

    What is the main source of natural light on Earth mentioned in the text?

    <p>$ ext{The Sun}$</p> Signup and view all the answers

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