Home
Class 12
PHYSICS
The number of photons falling per second...

The number of photons falling per second on a completely darkened plate to produce a force of `6.62xx10^-5N` is 'n'. If the wavelength of the light falling is `5xx10^-7`m, then n= __________ `xx10^22.`
`(h=6.62 xx10^-34 J-s )`

Text Solution

Verified by Experts

The correct Answer is:
5
Promotional Banner

Topper's Solved these Questions

  • NTA JEE MOCK TEST 73

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

  • NTA JEE MOCK TEST 75

    NTA MOCK TESTS|Exercise PHYSICS|25 Videos

Similar Questions

Explore conceptually related problems

The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100 W is (taking h = 6 xx 10^(-34) sec )

A monochromatic source of light operation at 200 W emits 4xx10^(20) photons per second. Find the wavelength of the light "(in" 10^(-7)m ).

If change in energy (DeltaE)=3xx10^(-8) J, h=6.64xx10^(-34) J-s and c=3xx10^8 m/s, then wavelength of the light is

The number of photons emitted per second by a 60 W source of monochromatic light of wavelength 663 nm is: (h=6.63xx10^(-34)Js )

A. How many photons of a tradiation of wavelength lamda=5xx10^(-7) m must fall per second on a blackened plate in order to produce a force of 6.62xx10^(-5) N? B. At what rate will the temperature of plate rise if its mass is 19.86kg and specific heat is equal to 2500J(kgK^(-1)) ?

What is the wavelength of light . Given energy =3.03xx10^(-19)J, h=6.6xx10^(-34)JS, c=3.0xx10^(8)m//s ?

The speed of electron having de Broglie wavelength of 10 ^(10) m is ( me = 9.1 xx 10 ^(-31) kg, h = 6.63xx 10^(-34) J-s)

A body of mass x kg is moving with a velocity of 100ms^(-1) . Its de-Broglie wavelength is 6.62xx10^(-35)m . Hence, x is: (h=6.62xx10^(-34)Js)

A monochromatic source of light operating at 500W emits 6xx10^(20) photon per second. Find the wavelength of the light used. Use h=6.6xx10^(-34)Js , C=3xx10^8m//s

NTA MOCK TESTS-NTA JEE MOCK TEST 74-PHYSICS
  1. One mole of an ideal monatomic gas at temperature T0 expands slowly ac...

    Text Solution

    |

  2. A current carrying wire is placed in the grooves of an insulating semi...

    Text Solution

    |

  3. A particle is projected at an angle of 60^(@) above the horizontal wit...

    Text Solution

    |

  4. A conveyor belt is moving at a constant speed of 2m//s . A box is gent...

    Text Solution

    |

  5. Two radioactive nuclei P and Q in a given sample decay into a stable n...

    Text Solution

    |

  6. Find the displacement equation of the simple harmonic motion obtained ...

    Text Solution

    |

  7. The compressibility of water is 4xx10^-5 per unit atmospheric pressure...

    Text Solution

    |

  8. A ray of sunlight enters a spherical water droplet(n=4//3)at an angle ...

    Text Solution

    |

  9. A uniform ring is rotating about vertical axis with angular velocity o...

    Text Solution

    |

  10. The area of the region covered by the TV., broadcast by a T.V. tower o...

    Text Solution

    |

  11. An iron rocket fragment initially at -100^@C enters the earth's atmosp...

    Text Solution

    |

  12. The dimensional formula for entropy is

    Text Solution

    |

  13. White light is used to illuminate the two slits in a Young's double sl...

    Text Solution

    |

  14. Two loudspeakers are being compared. One is preceived to be 32 times l...

    Text Solution

    |

  15. A spherical balll of mass m is the highest point in the space between ...

    Text Solution

    |

  16. A cart loaded with sand having total mass m(0)=1800kg moves on a str...

    Text Solution

    |

  17. An aeroplane is flying at a velocity of "900 km h"^(-1) loops a vertic...

    Text Solution

    |

  18. The position x of a particle with respect to time t along the x-axis i...

    Text Solution

    |

  19. A metal rod of length 2 m has cross sectional areas 2 A and A as shown...

    Text Solution

    |

  20. The number of photons falling per second on a completely darkened plat...

    Text Solution

    |