Question

A photon of blue light and a photon of red light are traveling in vacuum. The...

A photon of blue light and a photon of red light are traveling in vacuum. The photon of blue light...

A) has a smaller wavelength than a photon of red light and travels with the same speed.

B) has a smaller wavelength than a photon of red light and travels with a greater speed.

 

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Answer #1
Concepts and reason

The concept used to solve this problem is the relationship between frequency and wavelength.

Initially, use the relationship between frequency and wavelength to compare the wavelength.

Finally, use the electromagnetic spectrum and speed of light to find the correct option.

Fundamentals

The relationship between frequency and wavelength of light is given below:

Here, the frequency is , the speed of light is , and the wavelength of light is .

The relationship between frequency and wavelength of light is given below:

The frequency of red light is smaller than the blue light.

From the above expression, it is found that the frequency is inversely proportional to wavelength. For an electromagnetic wave, the speed is the same as the speed of light in vacuum.

The incorrect option is as follows:

• (B)The photon of blue light has a smaller wavelength than a photon of red light and travels with greater speed.

The frequency of red light is smaller than the blue light. Hence, the wavelength of the photon of blue light is greater than the wavelength of photon of red light

The red light and blue light are in the visible region of the electromagnetic spectrum. The speed of an electromagnetic wave in vacuum is equal to the speed of light in vacuum.

Hence, the correct option is as follows:

• (A)The photon of blue light has a smaller wavelength than a photon of red light and travels with same speed.

Ans:

The photon of blue light has a smaller wavelength than the photon of red light and travels with the same speed.

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