English, asked by oOHEARTHACKEROo1, 19 days ago

1. Red light has a frequency of 4.0 x 1014 hz. Find the speed of red light in a vacuum if its wavelength is 7.5 x 10-7 m?

2. As the red light above enters a glass medium, its wavelength changes to 5.8 x 10-7 m but its frequency remains constant. What is the speed of red light in this glass?

3. Find the speed of green light if its wavelength changes to 4.2 x 10-7 m. (Please refer to question #1 for the value of the frequency of green light.)

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Answers

Answered by rudrasingh190212
3

Answer:

1.ans)Same kind of wave, so same speed.: Red light has a frequency of 4.0 X 1014-hz. rottee, this is the 7.5 X 10-7-m. v=df = (7.5x10?) (4x104) = 3x108 m/s avoco

other two answers I don't know

Answered by brainlysme13
4

1) Speed of red light in a vacuum is 30.0 × 10^7 m/s

We have been given the following:

\nu = 4.0 \times 10^{14} \hspace{0.1cm} Hz,

\lambda = 7.5 \times 10^{-7} m

We know that speed of wave = wavelength × frequency

s = ν × λ

s = 4.0 \times 10^{14} \times 7.5 \times 10^{-7}

s = 30.0 \times 10^{7} \hspace{0.1cm} m/s

2) Speed of red light in glass is 23.2 × 10^7 m/s

We have been given that when red light enters the glass, wavelength changes but the frequency remains the same

\nu = 4.0 \times 10^{14} \hspace{0.1cm} Hz,  

\lambda = 5.8 \times 10^{-7} m

Now, s = ν × λ

s = 4 \times 10^{14} \times 5.8 \times 10^{-7}

s = 23.2 \times 10^{7} \hspace{0.1cm} m/s

3) Speed of green light in a vacuum is 30.0 × 10^7 m/s

We have been given that the frequency of green light is the same as the frequency in #1

\nu = 4.0 \times 10^{14} \hspace{0.1cm} Hz,

\lambda = 4.2 \times 10^{-7} m

Therefore, s = ν × λ

s = 4.0 \times 10^{14} \times 4.2 \times 10^{-7}

s = 16.8 \times 10^{7} \hspace{0.1cm} m/s

#SPJ2

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