Light from a red laser pointer has a speed of 3.0×10^8 m/s and has a wavelength of 6.5×10^−7 m . What is the frequency of this light?

Question

Light from a red laser pointer has a speed of 3.0×10^8 m/s and has a wavelength of 6.5×10^−7 m . What is the frequency of this light?
A.
2.0×10^2 m^2/s
B.
4.6×10^14 1/s
C.
4.6 s
D.
2.2×10^−15 s

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Linh Đan 3 years 2021-07-26T10:27:14+00:00 2 Answers 30 views 0

Answers ( )

  1. hongcuc2
    0
    2021-07-26T10:28:32+00:00
    Reply

    Answer:

    B.

    4.6×10^14 1/s

    Explanation:

    v = f × lambda

    Where,

    v is the velocity

    f is the frequency

    Lambda is the wavelength

    3.0 × 10⁸ = f × 6.5 × 10^-7

    f = (3 × 10⁸) ÷ (6.5 × 10^-7)

    f = (3/6.5) × 10^(8 – -7)

    f = 0.4615384615 × 10¹⁵

    f = 4.615384615 × 10¹⁴

  2. Dulcie
    0
    2021-07-26T10:28:32+00:00
    Reply

    Answer:

    the answer is b

    Explanation:

    because you multiply speed times wavelength

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