DUAL NATURE OF RADIATION AND MATTER Set 2

An important spectral emission line has a wavelength of 21cm. The corresponding photon energy is Js and

Photons of energy of 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photoelectrons will be

A ratio transmitter operates at a frequency 880 kHz and a power of 10 kW. The number of photons emitted per second is

The temperature at which protons in proton gas would have enough energy to overcome Coulomb barrier of 4.14 x 10⁻¹â´ J is (Boltzmann constant =  1.38 x 10⁻²³JK⁻¹)

The longest wavelength that can be analysed by a sodium chloride crystal of spacing in the second order is

Which of the following metal thermionically emits an electron at a relatively lowest temperature among them

From the following, what charges can be present on oil drops in Millikan's experiment
(Here e is the electronic charge)

The maximum wavelength of radiation that can produce photoelectric effect in certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be

In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is m and stopping potential is 2.5 V. The threshold frequency of the metal (in Hz ) approximately (charge on electron C, Planck's constant J-s)

Penetrating power of -rays can be increased by