Home
Class 12
CHEMISTRY
How many photons of wavelength , 50 Å ar...

How many photons of wavelength , `50 Å` are required to produce 0.2 J of energy ? (`h = 6.626 xx 10^(-34) J *s`)

Text Solution

Verified by Experts

Let the number of photons be n .
`E = n h (C)/(lambda) ` or , 0.2 = `n xx 6.626 xx 10^(-34) xx (3 xx 10^(8))/(50 xx 10^(-10))`
or , n = `5.03 xx 10^(15)`
Promotional Banner

Topper's Solved these Questions

  • MODEL QUESTIONS PAPER

    CHHAYA PUBLICATION|Exercise SET II ( SECTION II ) ( GROUP C)|22 Videos

  • MODEL QUESTIONS PAPER

    CHHAYA PUBLICATION|Exercise SET II ( SECTION II ) ( GROUP D)|15 Videos

  • MODEL QUESTIONS PAPER

    CHHAYA PUBLICATION|Exercise SET II ( SECTION II ) ( GROUP A)|6 Videos

  • MODEL QUESTION PAPER

    CHHAYA PUBLICATION|Exercise Answer the following question (set-3)|130 Videos

  • ORGANIC CHEMISTRY : BASIC PRINCIPLES AND TECHNIQUES

    CHHAYA PUBLICATION|Exercise WARM UP EXERICSE|132 Videos

Similar Questions

Explore conceptually related problems

How many photons of light with wavelength 400 nm can provide 1 J energy? [h=6.626xx10^(-34)J*s]

Among the photoelectrons, emitted due to incidence of light of frequency f on a metal surface , only the electrons having the highest kinetic energy can ionise a hydrogen atom. If this experment is performed with light of frequency 5/6f , the photoelectron having the highest kinetic energy can excite a hydrogen atom and from this excited hydrogen atom a photon of wavelength 1215 Å is emitted . Determine the (ii) value of f. Given h=6.625 xx10^(-34)*s,c=3xx10^(8)*s^(-1), 1 eV=1.6 xx10^(-19)J , ionisation energy of hydrogen =13.62 eV.

How many photons will a source of power 50W produce per second? The wavelength of an emitted photon is 6000 Å . Given , h = 6.62xx10^(-34)J.s

In a microwave over the electromagnetic waves are generated having wavelength of the order of 1 cm. Find the energy of the microwave photon. (h = 6.33 xx 10^(-34) J.s) .

Photoelectric threshold wavelength for a metal is 3800 Å . Find the maximum kinetic energy of emitted photoelectron, when ultraviolet radiation of wave length 2000Å is incident on the metal surface. Planck's constant, h = 6.62 xx 10^(-34) J.s

The energy released by the fission of one uranium atom is 200 MeV. The number of fissions per second required to produce 3.2 W of power is (Take leV = 1.6xx10^(-19)J)

Calculate the kinetic energy of a moving electron which has a wavelength of 4.8 pm. [mass of electron = 9.11 xx 10^(-31) kg, h = 6.626 xx 10^(-34) Kg m^2s^(-1) ].

If the mass of neutron is 1.7xx10^(-27) kg , then the de Broglie wavelength of neutron of energy 3eV is (h = 6.6xx10^(-34) J.s)

Find out the photoelectric threshold wavelength of copper. Given work function of copper = 4.52eV, h = 6.6 xx 10^(-34)J.s, 1 eV = 1.6 xx 10^(-19)J

Knowledge Check

  • If the mass of neutron is 1.7xx10^(-27) kg , then the de Broglie wavelength of neutron of energy 3eV is (h = 6.6xx10^(-34) J.s)

    A
    `1.4 xx 10^(-11) m`
    B
    `1.6 xx 10^(-10)m`
    C
    `1.65 xx 10^(-11) m`
    D
    `1.4 xx 10^(-10)m`