The work function of a metal is hvlt. Light of frequency v falls on this metal. The photoelectric effect will take place only if
(a) v > v0
(b) v > 2v0
(c) v < v0
(d) v < v0/2.
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Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’
• Suma is swimming in a pond. Suma is doing work as she is able to move herself by applying force with the movement of her arms and legs in...
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Light enters from air into glass having refractive index 1.50. What is the speed of light in glass? The speed of light in vacuum is 3 x 108 ms-1.
Given,n=1.5 and the speed of light in vacuum, c = 3x 108 ms-1. We know that the refractive index is given by the expression n =c/v where c is the...
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a and b working together can do a work in 6 days.if A takes 5 days less than B to to finish the work in how many days B alone can can do the work
B alone finish work in x days A alone work in x - 5 A one day works= 1/(x-5) and B one day works = 1/x A+B one day work = 1/6 so, 1/(x-5)...
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Light from a point source falls on a small area placed perpendicular to the incident light. If the area is
The illuminance will not change.
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Light of wavelength λ falls on a metal having work function hc/λ0.
(c) Photoelectric effect will take place only if λ < λ0.
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Ram is twice as good as Shyam in work; Shyam will do a piece of work in 30 days; in how many days Ram will do the work?
Since Ram is twice as good, he will do the work in 30/2 =15 days
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W can do 25% of a work-in 30 days, X can do 1/4 of the work in 10 days, Y can do 40% of the work
(d) W can do 25% of a work in 30 days. W can do1/4of a work in 30 days W can do the complete work in 120 days. X can do1/4of the work...
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The light emitted in the transition n = 3 to n = 2 in hydrogen is called Hα light. Find the maximum work function
n1 = 2, n2 = 3 Energy possessed by Hα light = 13.6 (1/n12 – 1/n22) = 13.6 x (1/4 – 1/9) = 1.89 eV. For Hα light to be able to emit photoelectrons from a metal...
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A light beam of wavelength 400 nm is incident on a metal plate of work function 2.2 eV.
a) When λ = 400 nm Energy of photon=hc/ λ=1240/400=3.1eV This energy given to electron But for the first collision energy lost = 3.1 ev x 10% = 0.31 ev for second collision energy lost = 3.1 ev...
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What is Perfectly Elastic Supply? When price falls by Rs.2 per unit, supply falls from 100 units to 80 units.
Es = P/Q x ΔQ/ΔP = P/100 x -20/-2 = 400/20 = Rs. 20
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