Dual Nature of ...

de - Broglic wavelength of electron in nth Bohr orbit is............

If work function of potassium is 3 eV. its threshold wavelength = ..................
(h = 6.625 × 10^–34 J.s, c = 3 × 10⁸ ms^–1. 1 eV = 1.6 × 10^–19 J.s)

In photo electric effect, if threshold wave length of a metal is 5000 Å work function of this metal is....................eV.
(h = 6.625 × 10^–34 J.s, c = 3 × 10⁸ ms^–1. 1 eV = 1.6 × 10^–19 J.s)

Work functions for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If threshold wavelength of sodium is 5460 Å , threshold wavelength for tungsten will be......................Å 

Photo sensitive surface is incident by light having frequency 3 times its threshold frequency. In this condition, if frequency of light is made half and intensity of light is made double, magnitude of photo electric current becomes........................

If ratio of threshold frequencies of two metals is 1 : 3, ratio of their work functions is.............

It work function of Na and Fe are 2.5 eV and 5 eV respectively ratio of their threshold frequencies.........................

If electron is accelerated under the effect of 200 V p.d., its kinetic energy = ...................

In quantum mechanics, a particle.......................

The de-Broglie wavelength of a proton and α - particle is same. The ratio of their velocities will be.............. (α - particle is the He-nucleus, having two protons and two neutrons. Thus, its mass M_α = 4m_p where m_p is the mass of the proton.)