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The distance of the sun from the earth i...

The distance of the sun from the earth is one hundred forty million four hundred thousand kilometers and light travels from the former to the latter in 7 minutes and fifty eight seconds. The velocity of light per second is :

A

` 3 xx 10 ^(5) ` km/sec

B

` 0.3 xx 10 ^(5) km//sec`

C

` 30 xx 10 ^(5)` km/sec

D

None of these

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The mean distance of sun from the earth is 1.5xx10^8km . The time taken by light to reach earth from the sun is

    A
    `0.12min`
    B
    `8.33min`
    C
    `12.5min`
    D
    `6.25min`

  • A gun is fired at a distance of 1.7 km from Ram and he hears the sound after 25 seconds. The speed of sound in metres per second is :

    A
    60
    B
    62
    C
    64
    D
    68

  • In Young's double-slit experiment, the slit are 0.5 mm apart and the interference is observed on a screen at a distance of 100 cm from the slits, It is found that the ninth bright fringe is at a distance of 7.5 mm from the second dark fringe from the center of the fringe pattern. The wavelength of the light used is

    A
    `5000 Å`
    B
    `(5000)/(7) Å`
    C
    `2500 Å`
    D
    `(2500)/(7) Å`

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