9. Quantum Mechanics

Speed of Light

9. Quantum Mechanics

# Speed of Light - Video Tutorials & Practice Problems

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The **Speed of Light** in a vacuum is related to the wavelength and frequency of a light particle.

Speed of Light

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concept

## Speed of Light

Video duration:

57sPlay a video:

2

example

## Speed of Light Example 1

Video duration:

1mPlay a video:

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Problem

ProblemEven 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.

A

4.01 x 10

^{10}ÅB

3.07 x 10

^{10}ÅC

6.53 x 10

^{11}ÅD

2.54 x 10

^{11}Å4

Problem

ProblemThe distance between the earth and the sun is 1.496 x 10^{17} μm. How long (in mins) will it take for light to go from the sun to earth?

A

5.192 min

B

11.524 min

C

8.311 min

D

7.968 min

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Problem

ProblemWhen 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 10^{14} s^{-1}. What is the identity of this unknown element?

A

326 nm

B

585 nm

C

325 nm

D

454 nm

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PRACTICE PROBLEMS AND ACTIVITIES (29)

- 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 d...
- A popular kitchen appliance produces electromagnetic radiation with a frequency of 2450 MHz. With reference to...
- (a) What is the frequency of radiation that has a wavelength of 10 mm, about the size of a bacterium?
- (d) What distance does electromagnetic radiation travel in 0.38 ps?
- A laser pointer used in a lecture hall emits light at 650 nm. What is the frequency of this radiation?
- (a) A green laser pointer emits light with a wavelength of 532 nm. What is the frequency of this light?
- The distance from the sun to Earth is 1.496 * 108 km. How long does it take light to travel from the sun to Ea...
- What is the frequency of a microwave with l = 4.33 * 10-3 m?
- Calculate the frequency of each wavelength of electromagnetic radiation: a. 632.8 nm (wavelength of red light ...
- A certain cellular telephone transmits at a frequency of 825 MHz and receives at a frequency of 875 MHz. (a) W...
- (b) Fiber optic cable is available in 12 km lengths. How long will it take for a signal to travel that distanc...
- Consider the two waves shown here, which we will consider to represent two electromagnetic radiations: (b) Wha...
- Certain elements emit light of a specific wavelength when they are burned or heated in a non-luminous flame. ...
- The speed of sound in air is 344 m>s at room temperature. The lowest frequency of a large organ pipe is 30...
- In an experiment to study the photoelectric effect, a scientist measures the kinetic energy of ejected electro...
- 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...
- Moseley established the concept of atomic number by studying X rays emitted by the elements. The X rays emitt...
- Moseley established the concept of atomic number by studying X rays emitted by the elements. The X rays emitt...
- Moseley established the concept of atomic number by studying X rays emitted by the elements. The X rays emitte...
- 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). Wh...
- Calculate the wavelength (in nm) of the blue light emitted by a mercury lamp with a frequency of 6.88 × 1014 H...
- The wavelength of some red light is 700.5 nm. what is the frequency of this red light?
- Calculate the wavelength (in nm) of the red light emitted by a neon sign with a frequency of 4.74 × 1014 Hz.
- The wavelength of some violet light is 420.0 nm. What is the frequency of this violet light?
- The wavelength of some blue light is 470.0 nm. What is the frequency of this blue light?
- Calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 486.1 nm.
- Calculate the wavelength of each of the following frequencies of electromagnetic radiation.
- Calculate the frequency of each of the following wavelengths of electromagnetic radiation.
- Calculate the frequency of each of the following wave lengths of electromagnetic radiation.