9. Quantum Mechanics

Speed of Light

9. Quantum Mechanics

Speed of Light

Guided videos.

Learn with Jules

Speed of Light Example 1

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history of the speed of light and how its speed was determined

Why Is The Speed Of Light The Speed Of Light? | Answers With Joe

Why is the speed of light what it is? Maxwell equations visualized

Light Speed, Wavelength, and Frequency | Dimensional Analysis | Doc Physics

Doc Schuster

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Practice this topic

Multiple Choice

Even the music we listen to deals with how energy travels to get to our car radio. If an FM Radio station broadcasts its music at 97.7 MHz find the wavelength in angstroms of the radio waves. One angstrom is equal to 10^-10 m.

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Multiple Choice

The distance between the earth and the sun is 1.496 x 10¹⁷ μm. How long (in mins) will it take for light to go from the sun to earth?

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Multiple Choice

When they are burned, certain elements emit light at a specific wavelength. Some wavelengths for certain elements are provided below:

When burned, an unknown element emits light at a frequency of 9.23 x 10¹⁴ s^-1. What is the identity of this unknown element?

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Textbook Question

The speed of sound in dry air at 20 °C is 343 m/s and the lowest frequency sound wave that the human ear can detect is approximately 20 Hz. (a) What is the wavelength of such a sound wave?

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Textbook Question

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Textbook Question

(a) What is the frequency of radiation that has a wavelength of 10 mm, about the size of a bacterium?

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Textbook Question

(d) What distance does electromagnetic radiation travel in 0.38 ps?

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Textbook Question

A laser pointer used in a lecture hall emits light at 650 nm. What is the frequency of this radiation?

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Textbook Question

(a) A green laser pointer emits light with a wavelength of 532 nm. What is the frequency of this light?

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Textbook Question

The distance from the sun to Earth is 1.496 * 108 km. How long does it take light to travel from the sun to Earth?

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Textbook Question

What is the frequency of a microwave with l = 4.33 * 10-3 m?

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Textbook Question

Calculate the frequency of each wavelength of electromagnetic radiation: a. 632.8 nm (wavelength of red light from helium–neon laser) b. 503 nm (wavelength of maximum solar radiation) c. 0.052 nm (wavelength contained in medical X-rays)

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Textbook Question

A certain cellular telephone transmits at a frequency of 825 MHz and receives at a frequency of 875 MHz. (a) What is the wavelength of the transmitted signal in cm?

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Textbook Question

(b) Fiber optic cable is available in 12 km lengths. How long will it take for a signal to travel that distance assuming that the speed of light in the cable is the same as in a vacuum?

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Textbook Question

Consider the two waves shown here, which we will consider to represent two electromagnetic radiations: (b) What is the frequency of wave A?

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Textbook Question

Certain elements emit light of a specific wavelength when they are burned or heated in a non-luminous flame. Historically, chemists used such emission wavelengths to determine whether specific elements were present in a sample. Some characteristic wavelengths for a few of the elements are given in the following table: Ag 328.1 nm Fe 372.0 nm Au 267.6 nm K 404.7 nm Ba 455.4 nm Mg 285.2 nm Ca 422.7 nm Na 589.6 nm Cu 324.8 nm Ni 341.5 nm (c) When burned, a sample of an unknown substance is found to emit light of frequency 6.58 * 1014 s-1. Which of these elements is probably in the sample?

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Textbook Question

The speed of sound in air is 344 m>s at room temperature. The lowest frequency of a large organ pipe is 30 s - 1 and the highest frequency of a piccolo is 1.5 * 104 s - 1. Find the difference in wavelength between these two sounds.

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Textbook Question

In an experiment to study the photoelectric effect, a scientist measures the kinetic energy of ejected electrons as a function of the frequency of radiation hitting a metal surface. She obtains the following plot. The point labeled 'n0' corresponds to light with a wavelength of 542 nm. (a) What is the value of n0 in s - 1?

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Textbook Question

The distance from Earth to the sun is 1.5 * 108 km. Find the number of crests in a light wave of frequency 1.0 * 1014 s - 1 traveling from the sun to Earth.

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Textbook Question

Moseley established the concept of atomic number by studying X rays emitted by the elements. The X rays emitted by some of the elements have the following wavelengths: Element Wavelength (pm) Ne 1461 Ca 335.8 Zn 143.5 Zr 78.6 Sn 49.1 (d) Use the result from part (b) to predict the X-ray wavelength emitted by iron.

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Textbook Question

Moseley established the concept of atomic number by studying X rays emitted by the elements. The X rays emitted by some of the elements have the following wavelengths: Element Wavelength (pm) Ne 1461 Ca 335.8 Zn 143.5 Zr 78.6 Sn 49.1 (e) A particular element emits X rays with a wavelength of 98.0 pm. What element do you think it is?

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Textbook Question

Moseley established the concept of atomic number by studying X rays emitted by the elements. The X rays emitted by some of the elements have the following wavelengths: Element Wavelength (pm) Ne 1461 Ca 335.8 Zn 143.5 Zr 78.6 Sn 49.1 (a) Calculate the frequency, n, of the X rays emitted by each of the elements, in Hz.

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Open Question

An FM radio station found at 103.1 on the FM dial broadcasts at a frequency of 1.031 × 10⁸ s⁻¹ (103.1 MHz). What is the wavelength of these radio waves in meters?

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Open Question

Calculate the wavelength (in nm) of the blue light emitted by a mercury lamp with a frequency of 6.88 × 10¹⁴ Hz.

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Open Question

The wavelength of some red light is 700.5 nm. what is the frequency of this red light?

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Open Question

Calculate the wavelength (in nm) of the red light emitted by a neon sign with a frequency of 4.74 × 10¹⁴ Hz.