Match List-$I$ (Event) with List-$II$ (Order of the time interval for happening of the event) and select the correct option from the options given below the lists:
List-$I$ List-$II$
$(1)$ Rotation period of earth $(i)$ $10^5\, s$
$(2)$ Revolution period of earth $(ii)$ $10^7\, s$
$(3)$ Period of light wave $(iii)$ $10^{-15}\, s$
$(4)$ Period of sound wave $(iv)$ $10^{-3}\, s$

  • A
    $(1)-(i), (2)-(ii), (3)-(iii), (4)-(iv)$
  • B
    $(1)-(ii), (2)-(i), (3)-(iv), (4)-(iii)$
  • C
    $(1)-(i), (2)-(ii), (3)-(iv), (4)-(iii)$
  • D
    $(1)-(ii), (2)-(i), (3)-(iii), (4)-(iv)$

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Similar Questions

Precise measurements of physical quantities are a need of science. For example,to ascertain the speed of an aircraft,one must have an accurate method to find its positions at closely separated instants of time. This was the actual motivation behind the discovery of radar in World War $II$. Think of different examples in modern science where precise measurements of length,time,mass,etc.,are needed. Also,wherever you can,give a quantitative idea of the precision needed.

$(a)$ The earth-moon distance is about $60$ earth radii. What will be the angular diameter of the earth (approximately in degrees) as seen from the moon?
$(b)$ The moon is seen to have an angular diameter of $(1/2)^{\circ}$ from the earth. What is its relative size compared to the earth?
$(c)$ From parallax measurement,the sun is found to be at a distance of about $400$ times the earth-moon distance. Estimate the ratio of sun-earth diameters.

The magnitude of any physical quantity

The moon is observed from two diametrically opposite points $A$ and $B$ on Earth. The angle $\theta$ subtended at the moon by the two directions of observation is $1^{\circ} 54^{\prime}$. Given the diameter of the Earth to be about $1.276 \times 10^{7} \; m$,compute the distance of the moon from the Earth.

What is accuracy in measurement? Accuracy depends on which factors?

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