Light Quiz Practice (Use any formulas, data etc. from class)

Which of the following frequencies corresponds to light with the longest wavelength?

(Note: calculations are not needed here)

• 3.00 x 10¹³ 1/s

• 4.12 x 10⁵ 1/s

• 8.50 x 10²⁰ 1/s

• 9.12 x 10¹² 1/s

• 3.20 x 10⁹ 1/s

What is the wavelength of red light with frequency = 4.55 x 10¹⁴ Hz?

(Note: Calculations can be performed but are not required to answer this question.)

• 659 nm

• 1.52 x 10⁶ nm

• 455 nm

• 152 nm

• none of these

Which of the following symbols/units are correct?

• wavelength = λ

• frequency = ν

• speed of light = c

• hertz = 1/s or s^-1

• All are correct

A line in the spectrum of atomic mercury has a wavelength of 256 nm. The frequency of this light is ___.

• 8.54 x 10^-16 1/s

• 7.76 x 10^-19 1/s

• 1.17 x 10¹⁵ 1/s

• 76.7 1/s

• none of these

Which of the following types of radiation has the shortest wavelength, the highest energy and the highest frequency?

• Ultraviolet radiation

• Infrared radiation

• Visible red light

• Visible blue light

• None of these

Yellow light has a wavelength of 599 nm. The energy of one photon of this light is ___.

• 1.19 x 10^-31 J

• 5.99 x 10^-7 J

• 3.32 x 10^-19 J

• 5.01 x 10¹⁴ J

• 3.02 x 10¹⁸ J

The four lines observed in the emission spectrum of hydrogen tell us that ___.

• The hydrogen molecule has the formula H_4.

• We could observe more spectra lines if we had a stronger prism.

• There are four electrons in an excited hydrogen atom.

• There are four allowable energy jumps for the electron in a hydrogen atom.

• The spectrum of hydrogen is continuous.

Which one of the following types of electromagnetic radiation will travel at the highest speed?

• gamma radiation

• ultraviolet (UV) radiation

• infrared (IR) radiation

• visible light

• None of these

If an electron falls from n=5 to n=2, is this emission or absorption?

• emission

• absorption

• both emission and absorption

• neither emission or absorption

Which of the waves shown is the lowest energy radiation?

• A

• B

• C

• All of these waves are at the same energy.