Home
Class 12
PHYSICS
A small mirror of mass m is suspended by...


A small mirror of mass m is suspended by a light thread of length l. A short polse of laser falls on the mirror with energy E. Then, whoch of the following statement is correct?

A

If the pulse falls normally on the mirror, it deflects by `theta=(2E)/((mcsqrt(2gl)))`

B

If the pulse falls normally on the mirror, it deflects by `theta=(2E)/((mcsqrt(2g))`

C

Impulse in thread depends on angle at which the pulse falls on the mirror

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
C
Consider energy conservation and concept of impulse.
Promotional Banner

Topper's Solved these Questions

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Multiple Correct|10 Videos

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Linked Comprehension|44 Videos

  • PHOTOELECTRIC EFFECT

    CENGAGE PHYSICS ENGLISH|Exercise Subjective|16 Videos

  • NUCLEAR PHYSICS

    CENGAGE PHYSICS ENGLISH|Exercise ddp.5.5|14 Videos

  • RAY OPTICS

    CENGAGE PHYSICS ENGLISH|Exercise DPP 1.6|12 Videos

Similar Questions

Explore conceptually related problems

A small sphere of mass m is supended by a thread of length l. It is raised upto the height of suspension with thread fully stretched and released. Then, the maximum tension in thread will be

A simple pendulum consists of a small sphere of mass m suspended by a thread of length l . the sphere carries a positive charge q . The pendulum is placed in a uniform electric field of strength E directed vertically upwards. With what period will the pendulum oscillate if the electrostatic force acting on the sphere is less than the gravitational force?

A simple pendulum consists of a small sphere of mass m suspended by a thread of length l . the sphere carries a positive charge q . The pendulum is placed in a uniform electric field of strength E directed vertically upwards. With what period will pendulum oscillate if the electrostatic force acting on the sphere is less than the gravitational force ?

Consider the rotation of a rod of mass m and length I from position AB to AB' . Which of the following statements are correct?

A plane mirror M is arranged parallel to a wall W at a distance l from it. The light produced by a point source S kept on the wall is reflected by the mirror and produces a patch of light on the wall. The mirroo moves with velocity v towards the wall. Which of the following statement(s) is // are correct?

A bob of mass m suspended by a light string of length L is whirled into a vertical circle as shown in figure . What will be the trajectory of the particle if the string is cut at (a) Point B ? (b) Point C? (c) Point X?

In a photoelectric effect experiment , the maximum kinetic energy of the ejected photoelectrons is measured for various wavelength of the incident light. Figure shows a graph of this maximum kinetic energy K_(max) as a function of the wavelength lamda of the light falling on the surface of the metal. Which of the following statement/i is/ are correct?

When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L+l). The elastic potential energy stored in the extended wire is

A smooth ball of mass m is suspended from a light string of length 1 m . Another ball of mass 2m strikes the ball of mass in horizontally with a speed of u=sqrt(35)m//s . The coefficient of restitution for the collision is e . The string becomes loose, when it makes an angle of 30^(@) with the horizontal, find the value of e .

A point mass m is suspended from a light thread of length l, fixed at O, is whirled in a horizontal circle at constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are

CENGAGE PHYSICS ENGLISH-PHOTOELECTRIC EFFECT-Single Correct
  1. The energy of a photon is equal to the kinetic energy of a proton. T...

    Text Solution

    |

  2. Up to what potential V can a zinc ball (work function 3.74 eV) removed...

    Text Solution

    |

  3. A sensor is exposed for time t to a lamp of power P placed at a distan...

    Text Solution

    |

  4. A photon has same wavelength as the de Broglie wavelength of electrons...

    Text Solution

    |

  5. Light of intensity l is incident perpendicularly on a perfectly reflec...

    Text Solution

    |

  6. The de Broglie wavelength of a thermal neutron at 927^circC is lamda. ...

    Text Solution

    |

  7. A small mirror of mass m is suspended by a light thread of length l. A...

    Text Solution

    |

  8. A particle of mass 3m at rest decays into two particles of masses m an...

    Text Solution

    |

  9. The radius of seocnd orbit of an electron in hydrogen atom is 2.116 eV...

    Text Solution

    |

  10. Radiation of wavelength 546 nm falls on a photo cathode and electrons ...

    Text Solution

    |

  11. The human eye is most sensitive to green light of wavelength 505 nm. E...

    Text Solution

    |

  12. The light sensitive compound on most photographic films is silver brom...

    Text Solution

    |

  13. Photoelectric effect supports quantum nature of light because

    Text Solution

    |

  14. A point source of light is taken away from the experimental setup of p...

    Text Solution

    |

  15. The maximum kinetic energy of the emitted photoelectrons against frequ...

    Text Solution

    |

  16. In a photoelectric experiment, the wavelength of the incident light is...

    Text Solution

    |

  17. When a point light source of power W emitting monochromatic light of w...

    Text Solution

    |

  18. A collimated beam of light of flux density 30kWm^(-2) is incident norm...

    Text Solution

    |

  19. When photons of energy (hc)/(lamda) fall on a metal surface, photoelec...

    Text Solution

    |

  20. Threshold wavelength of certain metal is lamda0 A radiation of wavelen...

    Text Solution

    |