Home
Class 12
PHYSICS
Visible light has wavelengths in the ran...

Visible light has wavelengths in the range of 400 nm to 780nm. Calculate the range of energy of the photons of visible light.

Text Solution

Verified by Experts

We have `lambda_1 = 400 nm` to `lambda_2 = 780 nm `
h `=6.63 xx 10^(-34) J-s` ,
`d = 3 xx 10^(5) m/s `
` E_1 = hc / lambda_1 `
` = 6.63 xx 10^(-34) xx 3 xx 10^(8) / 400 xx 10^(-9)`
`= 6.63 xx 3 / 4 xx 10^(-9)`
` = 4.977245 xx 10^(-19) `
` 5 xx 10^(-19) J `
` E_2 = 6.63 xx 3 / 7.8 xx 10^(-19) `
`= 2.55 xx 10^(-19)J`
So, the range is `2.55 xx 10^(-19) J to 5 xx 10^(-19)`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • PHOTO ELECTRIC EFFECT AND WAVE PARTICLE DUALITY

    HC VERMA|Exercise objective II|7 Videos

  • PERMANENT MAGNETS

    HC VERMA|Exercise Exercise|25 Videos

  • PHOTOMETRY

    HC VERMA|Exercise All Questions|44 Videos

Similar Questions

Explore conceptually related problems

Write short nots on (d) Visible light

What do you mean by visible light?

Knowledge Check

  • Wavelength of X-rays is "__________" the wavelength of visible light.

    A
    smaller than
    B
    greater than
    C
    negligible when compared to
    D
    equal to

    • Similar Questions

    Explore conceptually related problems

    Calculate the momentum of a photon of light of wavelength 500nm .

    In a photoelectric experiment, it was found that the stopping potential decreases from 1.85 V to 0.82 V as the wavelength of the incident light is varied from 300nm to 400nm. Calculate the value of the Planck constant from these data.

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

    An electron and a proton, each has a wavelenght of 1.00 nm. Find the energy of the photon

    A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm. (a) What is the energy per photon associated with the sodium light? (b) At what rate are the photons delivered to the sphere?

    The wavelength of light waves ranges from _________ .

    In Young's double slit experiment, the distance of the screen from the two slits in 1m. When a light of wavelength 600nm is allowed to fall on the slits width of the fringes obtained on the screen is 2mm. Calculate the width of the fringe if the wavelength of the incident light is 400nm. Calculate band width in each case if the arrangement is immersed in water of refractive index 1.33.

    Home
    Profile