50 W/m |
|||

(a) |
20 10 |
(b) |
35 10 |

(c) |
15 10 |
(d) |
10 10 |

50 W/m |
|||

(a) |
20 10 |
(b) |
35 10 |

(c) |
15 10 |
(d) |
10 10 |

1 Answer

5876 Votes

3537

p= and pressure =I/c

∴ + ⇒ for one photon

∴ =pressure

But =50 W/m^{2}

∴^{ } =Pressure

∴ F_{n=} =20 10^{−8 }N

A child is looking for his father. He went 90 meters in the East before turning to his right. He went 20 meters before turning to his right again to look for his father at his uncle's place 30 meters from this point. His father was not there. From here he went 100 meters to the North before meeting his father in a street. How far did the son meet his father from the starting point ?

(A) 80 meters (B) 100 meters

(C) 140 meters (D) 260 meters

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