Home
Class 12
PHYSICS
A small mirror of area A and mass m is s...

A small mirror of area A and mass m is suspended in a vertical plane by a weightless string. A beam of light of intensity I falls normally on the mirror and the string is deflected from the vertical by a very small angle `theta` Assuming the mirror to be perfectly reflecting, obtain an expression for `theta`

A

Radiation pressure equal to `2I)/c`

B

Radiationi pressure equal to (I)/(2c)`

C

`tan theta = (2IA)/(mgc)`

D

`tan theta = (IA)/(2mgc)`

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • PHOTOELECTRIC EFFECT AND MATTER WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Unsolved numerical problems|42 Videos

  • PHOTOELECTRIC EFFECT AND MATTER WAVES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Numerical MCQs|60 Videos

  • NUCLEAR PHYSICS AND RADIOACTIVITY

    PHYSICS GALAXY - ASHISH ARORA|Exercise Concptual MCQs|48 Videos

  • THERMODYNAMICS LAWS & SPECIFIC HEATS OF GASES

    PHYSICS GALAXY - ASHISH ARORA|Exercise Practice Exercise 3.4|11 Videos

Similar Questions

Explore conceptually related problems

A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of 45^@ with the initial vertical direction is

Two plane mirrors are inclined at an angle theta to one another. A ray of light incident on the first mirror and parallel to the second mirror is reflected from the second mirror parallel to the first mirror. What is the value of theta ?

A simple pendulum of length I and mass (bob) m is suspended vertically. The string makes an angle theta with the vertical. The restoring force acting on the pendulum is

A simple pendulum of length l and mass (bob) m is suspended vertically. The string makes an angle theta with the vertical. The restoring force acting on the pendulum is

PHYSICS GALAXY - ASHISH ARORA-PHOTOELECTRIC EFFECT AND MATTER WAVES-Advance MCQ
  1. The intensity of light falling on a phototube is increased while keepi...

    Text Solution

    |

  2. Two photocathodes are illuminated by the light emitted by a single sou...

    Text Solution

    |

  3. Photoelectric effect supports quantum nature of light because (a) th...

    Text Solution

    |

  4. The momentum of a single photon of red light of fequency 400 xx 10^(12...

    Text Solution

    |

  5. When a monochromatic point source of light is at a distance of 0.2 m...

    Text Solution

    |

  6. In a photoelectric experiment, the collector plate is at 2.0 V with re...

    Text Solution

    |

  7. A small mirror of area A and mass m is suspended in a vertical plane b...

    Text Solution

    |

  8. When photons of energy 4.25 eV strike the surface of metal A, the ejec...

    Text Solution

    |

  9. In photoelectric effect, stopping potential depends on

    Text Solution

    |

  10. Thefigure shows the results of an experiment involving photoelectric e...

    Text Solution

    |

  11. the photoelectric effect can not be explained by the wave theory of li...

    Text Solution

    |

  12. A non-monochromatic light is used in an experiment on photoelectric ef...

    Text Solution

    |

  13. In a phtoelectron effect energy of photon is directly proportional to ...

    Text Solution

    |

  14. Suppose frequency of emitted photon is f(0) when the electron of a sta...

    Text Solution

    |

  15. A small miror is suspended by a thread as shownin figure 2.35. A short...

    Text Solution

    |

  16. When monochromatic light falls on a photosensitive material, the numbe...

    Text Solution

    |

  17. Mark the correct statement(s) related to the stopping potential differ...

    Text Solution

    |

  18. If the wavelength of light in an experiment on photo electric effect i...

    Text Solution

    |

  19. Photoelectric effect supports quantum nature of light because

    Text Solution

    |

  20. Photons of energy 5eV are incident on the cathode. Electrons reaching ...

    Text Solution

    |