Dual Nature of ...

Wavelength of incident radiation on photo sensitive surface is 4000 Å If wavelength of this light is 3600 Å , what will be change in kinetic energy of emitted photo electron ? (h = 6.625 × 10^–34 J.s, c = 3 × 10⁸ ms^–1, 1eV = 1.6 × 10^–19 J)

A hollow metallic custodial has mass 10 kg and length 10 cm. At what speed this custodial is moved in X-direction so that its de-Broglie wavelength exactly trapped in the custodial ?

If we take accelerating voltage V = 50 V, electric charge of electron e = 1.6 × 10^–19 C and mass of electron m = 9.1 × 10^–31 kg find the wavelength of concerned electron.

What will be energy in eV of photons of λ- rays having length 0.1 Å coming out of excited nucleus of radium?

How many photons of red coloured light having wavelength 8000 Å will have same energy as one photon of violet coloured light of wavelength 4000 Å ?

When a radiation of wavelength 3000 Å is incident on metal, 1.85 V stopping potential is obtained . What will be threshold wave length of metal ?

Output power of He-Ne LASER of low energy is 1.00 mW. Wavelength of the light is 632.8 nm. What will be the number of photons emitted per second from this LASER ?

A star which can be seen with naked eye from Earth has intensity 1.6 × 10^–9 Wm^–2 on Earth. If the corresponding wavelength is 560 nm, and the diameter of the human eye is 2.5 × 10^–3 m , the number of photons entering in our in 1 s is..............

Find the velocity at which mass of a proton becomes 1.1 times its rest mass, m_g = 1.6 × 10^–27 kg Also, calculate corresponding temperature. For simplicity, consider a proton as non-interacting ideal-gas particle at 1 atm pressure

Power produced by a star is 4 × 1028 W . If the average wavelength of the emitted radiations is considered to be 4500 Å the number of photons emitted in 1 s is...............