Home
Class 12
PHYSICS
Find the range of frequency of light tha...

Find the range of frequency of light that is visible to an average human being `(400nmltlamdalt700nm)`

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
Given that: `400nmltlamda,700nm`
`1/(700nm)lt1/lamdalt1/(400nm)`
`1/(7xx10^-7)lt1/lamdalt1/(4xx10^-7)`
`=(3xx10^8)/(7xx10^-7)ltc/lamdalt(3xx10^8)/(4xx10^-7)`
`[where c=sped of light `=3xx10^8m/s`]
`rarr 4.3xx10^14ltc/lamdalt7.5xx10^14`
`rarr 4.3x10^14Hzltflt7.5xx10^14Hz`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • LIGHT WAVES

    HC VERMA|Exercise Objective -2|10 Videos

  • GEOMETRICAL OPTICS

    HC VERMA|Exercise Exercises|79 Videos

  • MAGNETIC FIELD

    HC VERMA|Exercise Exercises|60 Videos

Similar Questions

Explore conceptually related problems

The range of audible frequency for thr human ear is _____.

Find the energy, the frequency and the momentum of an X-ray photon of wavelength 0.10 nm.

The wavelength of visible light range for human is between ___________ .

A glass surface is coated by an oil film of uniform thickness 1.00xx10^-4 cm. The index of refraction of the oil is 1.25 and that of the glass is 1.50. Find the wavelengths of light in the visible region (400nm-750nm) which are completely transmitted by the oil film under normal incidence.

An open organ pipe has a length of 5 cm. (a) Find the fundamental frequency of vibration of this pipe. (b) What is the highest harmonic of such a tube that is in the audible range ? Speed of sound in air is 340 ms^-1 and the audible range is 20-20,000 Hz.

In an experiment on photoelectric effect, the emitter and the collector plates are placed at a separation of 10cm and are connected through an ammeter without any cell. A magnetic field B exists parallel to the plates. The work function of the emitter is 2.39 e V and the light incident on it has wavelengths between 400nm and 600nm. Find the minimum value of B for which the current registered by the ammeter is zero. Neglect any effect of space charge.

Find the wavelength in a hydrogen spectrum between the range 500nm to 700nm

White light is used in a Young's double slit experiment. Find the minimum order of the violet fringe (lamda = 400 nm) which overlaps with a red fringe (lamda = 700 nm) .

The average range of frequencies at which human beings can hear sound waves varies from 20 Hz to 20 kHz. Calculate the wavelength of the sound wave in these limits . (Assume the speed of sound to be 340 ms^(-1)

The average range of frequencies at which human beings can hear sound waves varies from 20 Hz to 20 kHz. Calculate the wavelength of the sound wave in these limits. (Assume the speed of sound to be 340 ms^(-1) .

Home
Profile