1.

    The speed of light is approximately 3imes1083 imes 10^8 m/s. If a star is 4 light-years away, what is its distance in kilometers? (1 light-year = distance light travels in one year)

    A

    3.8imes10103.8 imes 10^{10} km

    B

    1.2imes10131.2 imes 10^{13} km

    C

    3.8imes10133.8 imes 10^{13} km

    D

    1.2imes1091.2 imes 10^9 km

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Unit Conversion, Speed, Distance, Time

    Related Questions

    1.

    The wavelength of a light wave is 500 nm. Express this wavelength in meters.

    A

    5 x 10^-9 m

    B

    5 x 10^-7 m

    C

    5 x 10^7 m

    D

    5 x 10^9 m

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :unit conversion, wavelength, scientific notation

    2.

    A protein molecule's diameter is measured as 42 Å using X-ray diffraction. If another measurement instrument gives the diameter in picometers (pm), and the ratio of the two measurements is x10\frac{x}{10}, what is the value of xx?

    A

    100

    B

    1000

    C

    420

    D

    42

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :Unit Conversion, Length, Scientific Notation

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