A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since, it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. In our experiment with rubidium photo-cell, the following lines from a mercury source were used:
`lambda_1 = 3650 oversetcircA`, `lambda_2=4047 oversetcircA`, `lambda_3=4358 oversetcircA`, `lambda_4=5461 oversetcircA`, `lambda_5=6907 oversetcircA`
The stopping voltages respectively were measured to be
`V_0=1.28 V`, `V_0.95V`, `V_0=0.74V`, `V_0=0.16`, `V_0=0V`
Determine the value of Planck's constant h.

A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission, since, it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. In our experiment with rubidium photo-cell, the following lines from a mercury source were used: lambda_1 = 3650 oversetcircA , lambda_2=4047 oversetcircA , lambda_3=4358 oversetcircA , lambda_4=5461 oversetcircA , lambda_5=6907 oversetcircA The stopping voltages respectively were measured to be V_0=1.28 V , V_0.95V , V_0=0.74V , V_0=0.16 , V_0=0V The threshold frequency and work function for the material.

Wavelength of light used in an opticla instrument are lambda_1=4,000 overset@A and lambda_2=5,000 overset @A ,then ratio of their respective resolving powers(corresponding to lambda_1 and lambda_2 ) is:

What is the ratio of velocity of light of wavelengths 4000 oversetcircA and 8000 oversetcircA in vacuum?

Two lamps, one rated 100 W at 220 V and other 60 W at 220 V, are connected in parallel to electric main supply. What current is drawn from the line if the supply voltage is 220 V?

Two lamps, one rated 100 W at 220 V, and the other 20W at 220V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220V?

Find the ratio of intensities at the two pints X and Y on a screen in Young's double slit experiment, where waves from the two sources S_1 and S_2 have path difference of 0 and lambda/4

The atomic radii of Cs^+ and Cl^- are 1.69 oversetcircA and 1.81 oversetcircA respectively. Predict the coordination number of Cs^+ ion and structure of CsCl?

Find the number of photons emitted per second by a 25 W source of monochromatic light of wavelength 6000 oversetcircA .

A ray of light travelling in air have wavelength lambda ,frequency v,velocity u and intensity I.If this ray enters into water,then these parameters are lambda',v',u' and I' respectively.which of the following relation is correct?