Home
Class 12
PHYSICS
A : The centre of sensitivity of our eye...

A : The centre of sensitivity of our eyes coincides with the centre of the wavelength distribution of the sun.
R : Humans have evolved with visions most sensitive to the strongest wavelength from the sun.

A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

B

Both 'A' and ’R' are true and 'R' is not the correct explanation of 'A

C

A' is true and 'R' is false

D

'A' is false and R' is true

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVES

    AAKASH SERIES|Exercise EXERCISE -II|22 Videos

  • ELECTROMAGNETIC WAVES

    AAKASH SERIES|Exercise EXERCISE -IA|47 Videos

  • ELECTROMAGNETIC INDUCTION

    AAKASH SERIES|Exercise Additional Exercise|11 Videos

  • ELECTROMAGNETICS

    AAKASH SERIES|Exercise ADDITIONAL EXERCISE|13 Videos

Similar Questions

Explore conceptually related problems

Human eyes are most sensitive to the wavelength of

The human eye is sensitive only to light having wave length ranging from

The diameter of the pupil of human eye is about 2 mm . Human eye is most sensitive to the wavelength 555 nm . Find the limit of resolution of human eye.

Consider a hypothetical solar system, which has two identical massive suns each of mass M and radius r, seperated by a seperation of 2sqrt(3)R (centre to centre). (R gtgtgtr). These suns are always at rest. There is only one planet in this solar system having mass m. This planet is revolving in circular orbit of radius R such that centre of the orbit lies at the mid point of the line joining the centres of the sun and plane of the orbit is perpendicular to the line joining the centres of the sun. Whole situation is shown in the figure.

Consider a hypothetical solar system, which has two identical massive suns each of mass M and radius r, seperated by a seperation of 2sqrt(3)R (centre to centre). (R>>r). These suns are always at rest. There is only one planet in this solar system having mass m. This planet is revolving in circular orbit of radius R such that centre of the orbit lies at the mid point of the line joining the centres of the sun and plane of the orbit is perpendicular to the line joining the centres of the sun. Whole situation is shown in the figure. Q. Speed of the planet is

Consider a hypothetical solar system, which has two identical massive suns each of mass M and radius r, seperated by a seperation of 2sqrt(3)R (centre to centre). (R gtgtgtr). These suns are always at rest. There is only one planet in this solar system having mass m. This planet is revolving in circular orbit of radius R such that centre of the orbit lies at the mid point of the line joining the centres of the sun and plane of the orbit is perpendicular to the line joining the centres of the sun. Whole situation is shown in the figure. Q. Average force on the planet in half revolution is

Two concentric rings, one of radius R and total charge +Q and second of radius 2R and total charge -sqrt(8)Q , lie in x-y plane (i.e., z=0 plane). The common centre of rings lies at origin and the common axis coincides with z -axis. The charge is uniformly distributed on both rings. At what distance from origin is the net electric field on z -axis zero?

Thin films, including soap bubbles and oil show patterns of alternative dark and bright regions resulting from interference among the reflected ligth waves. If two waves are in phase, their crests and troughs will coincide. The interference will be cosntructive and the amlitude of resultant wave will be greater then either of constituent waves. If the two wave are not of phase by half a wavelength (180^(@)) , the crests of one wave will coincide width the troughs of the other wave. The interference will be destructive and the ampliutde of the resultant wave will be less than that of either consituent wave. 1. When incident light I, reaches the surface at point a, some of the ligth is reflected as ray R_(a) and some is refracted following the path ab to the back of the film. 2. At point b, some of the light is refracted out of the film and part is reflected back through the film along path bc. At point c, some of the light is reflected back into the film and part is reflected out of the film as ray R_(c) . R_(a) and R_(c) are parallel. However, R_(c) has travelled the extra distance within the film fo abc. If the angle of incidence is small, then abc is approxmately twice the film's thickness . If R_(a) and R_(c) are in phase, they will undergo constructive interference and the region ac will be bright. If R_(a) and R_(c) are out of phase, they will undergo destructive interference and the region ac will be dark. I. Refraction at an interface never changes the phase of the wave. II. For reflection at the interfere between two media 1 and 2, if n_(1) gt n_(2) , the reflected wave will change phase. If n_(1) lt n_(2) , the reflected wave will not undergo a phase change. For reference, n_(air) = 1.00 . III. If the waves are in phase after reflection at all intensities, then the effects of path length in the film are: Constrictive interference occurs when 2 t = m lambda // n, m = 0, 1,2,3 ,... Destrcutive interference occurs when 2 t = (m + (1)/(2)) (lambda)/(n) , m = 0, 1, 2, 3 ,... If the waves are 180^(@) out of the phase after reflection at all interference, then the effects of path length in the film ara: Constructive interference occurs when 2 t = (m + (1)/(2)) (lambda)/(n), m = 0, 1, 2, 3 ,... Destructive interference occurs when 2 t = (m lambda)/(n) , m = 0, 1, 2, 3 ,... The average human eye sees colors with wavelength between 430 nm to 680 nm. For what visible wavelength (s) will a 350 nm thick (n = 1.35) soap film produce maximum destructive interference?

The small dense stars rotate about their common centre of mass as a binary system, each with a period of 1 year. One star has mass double than that of the other, while mass of the lighter star is one-third the mass of the Sun. The distance between the two stars is r and the distance of the earth from the Sun is R , find the relation between r and R .

The light from the sun is found to have a maximum intensity near the wavelength of 470nm. Assuming that the surface o f the sun emits as a blackbody, calculate the temperature of the surface of the sun.

AAKASH SERIES-ELECTROMAGNETIC WAVES-EXERCISE -IB
  1. (A) : In micro wave oven the energy is not wasted in heating up the ve...

    Text Solution

    |

  2. A : infrared waves are often called heat waves. R : Infrared waves v...

    Text Solution

    |

  3. A : The centre of sensitivity of our eyes coincides with the centre of...

    Text Solution

    |

  4. A current I is flowing in a straight conductor of length L. The magnet...

    Text Solution

    |

  5. (A) : In Ampere Maxwell law, displacement current has same physical ef...

    Text Solution

    |

  6. (A ): Speed of EM wave in a medium depends on electrical permittivity ...

    Text Solution

    |

  7. (A ): E.M. waves can show diffraction effect (R) : E.M waves are trans...

    Text Solution

    |

  8. (A ): In electromagnetic wave, electric and magnetic fields oscillate ...

    Text Solution

    |

  9. (A ): The light can travel in vacuum but sound cannot do so (R) : Ligh...

    Text Solution

    |

  10. (A): Gamma rays are more energetic than X-rays (R) : Gamma rays are of...

    Text Solution

    |

  11. Assertion : The earth without its atmosphere would be inhospitably col...

    Text Solution

    |

  12. A : Environmental damage has depleted the ozone layer in the atmosphe...

    Text Solution

    |

  13. (A) : The microwaves are better carriers of signals than radio waves. ...

    Text Solution

    |

  14. Assertion (A) : The presence of CO(2) in the air accelerates corrosio...

    Text Solution

    |

  15. A satellite orbiting close to the surface of earth does not fall down ...

    Text Solution

    |

  16. (A) : The average magnitude of poynting vector vecS is the intensity o...

    Text Solution

    |

  17. A : Long distance radio broadcasts use short-wave bands. R : Ionosp...

    Text Solution

    |

  18. A : It is necessary to use satellites for long distance TV transmissi...

    Text Solution

    |

  19. A : Optical and radio telescopes are built on the ground but X-ray ...

    Text Solution

    |

  20. The ozone layer on the top of the stratosphere is crucial for human su...

    Text Solution

    |