Home
Class 12
PHYSICS
Let n(r) and n(b) be respectively the nu...

Let `n_(r)` and `n_(b)` be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time. Then :

A

`n_(r)=n_(b)`

B

`n_(r)ltn_(b)`

C

`n_(r)gtn_(b)`

D

The information is insufficient to get a relation between `n_(r)` and `n_(b)`

Text Solution

Verified by Experts

The correct Answer is:
C
`P=nv=` constant
For red coloured ligh, `n_(r)` is more because v is less.
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS & PHOTONS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL-III)|9 Videos

  • ELECTRONS & PHOTONS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS|20 Videos

  • ELECTRONS & PHOTONS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS|20 Videos

  • ELECTROMAGNETIC WAVES

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS|4 Videos

  • ELECTROSTATICS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS |39 Videos

Similar Questions

Explore conceptually related problems

Let n(A)=3 and n(B)=6 and A ulsub B. Then number of elements is A nn B is :

Let a,b,c are respectively the sums of the first n terms, the next n terms and the next n terms of a GP. Show that a,b,c are in GP.

Let n(A) = m and n(B) = n. Then the total number of non-empty relations that can be defined from A to B is

Number of photons of wavelength 600 nm, emitted per second by an electric bulb of power 60 W is (Take h = 6 x 10^-34 Js )

Let n_1, and n_2 , be the number of red and black balls, respectively, in box I. Let n_3 and n_4 ,be the number one red and b of red and black balls, respectively, in box II. A ball is drawn at random from box 1 and transferred to box II. If the probability of drawing a red ball from box I, after this transfer, is 1/3 then the correct option(s) with the possible values of n_1 and n_2 , is(are)

The number of particles given by n=-D(n_(2)-n_(1))/(x_(2)-x_(1)) are crossing a unit area perpendicular to x -axis in unit time, where n_(1) and n_(2) are the number of particles per unit volume for the values x_(1) and x_(2) of x respectively. Then the dimensional formula of diffusion constant D is :

Let n_(1)and n_(2) be the number of red and black balls, respectively, in box I. Let n_(3) and n_(4) be the numbers of red and black balls, respectively, in the box II. One of the two boxes, box I and II, was selected at random and a ball was drawn randomly our of this box. The ball was found to be red. If the probability that this red ball drawn from box II is 1/3 then the possible values of n_(1),n_(2),n_(3)and n_(4) is (are)

Let S_(n) denote the sum of the cubes of the first n natural numbers and s_(n) denote the sum of the first n natural numbers. Then sum_(r=1)^(n)(S_(r))/( S_(r )) equals :

(a) The number of nuclei of a given radioactive nucleus, at times t=0 and t=T , are N_0 and (N_(0)//n) respectively. Obtain an expression for the half life (T_(1//2)) of this nucleus in terms of n and T. (b) Identify the nature of the 'radioactive radiations', emitted in each step of the 'decay chain' given below: ""_(Z)^(A) X to ""_(Z-2)^(A-4) Y to ""_(Z-2)^(A-4) Yto""_(Z-1)^(A-4)W

MODERN PUBLICATION-ELECTRONS & PHOTONS-MULTIPLE CHOICE QUESTIONS (LEVEL-II)
  1. The radiation emitted when an electron jumps from n=3 to n = 2 orbit i...

    Text Solution

    |

  2. A monochromatic light source of frequency villuminates a metallic surf...

    Text Solution

    |

  3. In Ques, 136, the frequency v of the source is :

    Text Solution

    |

  4. Let n(r) and n(b) be respectively the number of photons emitted by a r...

    Text Solution

    |

  5. For a particle of mass m enclosed in a one-dimentional box of length L...

    Text Solution

    |

  6. An electron accelerated under a potential difference V volt has a cert...

    Text Solution

    |

  7. In Davisson-Germer experiment, the correct relation between angle of d...

    Text Solution

    |

  8. The potential difference applied to an X-ray tube is 5kV and current i...

    Text Solution

    |

  9. The work function of a substance is 4.0 eV. The longest wavelength of ...

    Text Solution

    |

  10. A charged oil drop is suspended in a uniform field of 3xx10^(4) V/m so...

    Text Solution

    |

  11. Fig. shows variation of photocurrent with anode potential for photosen...

    Text Solution

    |

  12. An element with Z = 11 emits Kalpha-X-ray with wavelength lamda. The a...

    Text Solution

    |

  13. The wavelength of K(alpha) line of an X-ray spectrum of an element of ...

    Text Solution

    |

  14. The graph between the stopping potential (V(0)) and wave number (1//la...

    Text Solution

    |

  15. Electrons with de-Broglie wavelength lamda fall on the target in an X-...

    Text Solution

    |

  16. Direction : Question Numbers. 150 and 151 are based on the following p...

    Text Solution

    |

  17. Direction : Question Numbers. 150 and 151 are based on the following p...

    Text Solution

    |

  18. In an experiment, electrons are made to pass through a narrow slit of ...

    Text Solution

    |

  19. The surface of a metal is illuminated with the light of 400 nm. The ki...

    Text Solution

    |

  20. Photoelectric effect experiments are performed using three different m...

    Text Solution

    |