(1) The speed of light through vacuum is 3 x 10⁸ m/s.
(2) The speed of light in air at 30⁰C is 350 m/s.
(3) The speed of light in air at 0⁰C is 330 m/s.
(4) The transparent substance is glass.
(5) The color of light observed is red.
(6) The energy of a photon of red light is 2.85 x 10⁻¹⁹ J.
<h3>
Speed of light</h3>
The speed of light through vacuum is 3 x 10⁸ m/s.
The speed of light in air at 30⁰C is 350 m/s.
The speed of light in air at 0⁰C is 330 m/s
<h3>Refractive index of the substance</h3>
n = speed of light in vacuum/speed of light in the substance
n = ( 3 x 10⁸ m/s) / ( 2 x 10⁸ m/s)
n = 1.5
The refractive index of glass is 1.5, thus, the transparent substance is glass.
<h3>Frequency of light</h3>
f = v/λ
f = (3 x 10⁸) / (6.8 x 10⁻⁷)
f = 4.41 x 10¹⁴ Hz
The color of light observed is red based on the frequency and wavelength.
<h3>Energy of the photon</h3>
E = hf
E = (6.626 x 10⁻³⁴)(4.3 x 10¹⁴)
E = 2.85 x 10⁻¹⁹ J
Thus, the speed of light through vacuum is 3 x 10⁸ m/s.
The speed of light in air at 30⁰C is 350 m/s.
The speed of light in air at 0⁰C is 330 m/s.
The transparent substance is glass.
The color of light observed is red.
The energy of a photon of red light is 2.85 x 10⁻¹⁹ J.
Learn more about speed of light here: brainly.com/question/104425
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