A beam of fast moving alpha particles were directed towards a thin film of gold. The parts `A', B'` and `C'` of the transmitted and refected beams correcponding ro the incident parts `A, B` and `C` of the beam, are shown in the adjoining diagram. The number of alpha particles in

A beam of alpha - particle is incident on a gold foil . Corresponding to the incident beams A , B and C , the emergent beams A' , B' and C' . The transmission and deflection of alpha - particles through the foil take place such that

In the electric circuit shown in Fig., label the parts A, B, C, D, E, and E State the function of each part. Show in the diagram the direction of flow of current.

In the electric circuit shown in Fig. 1, label the parts A, B, C, D, E, and F State the function of each part. Show in the diagram the direction of flow of current.

A parallel beam, of light of wavelength 100 nm passed through a sample of atomic hydrogen gas in ground state. (a) Assume that when a phton supplies some of its energy to a hydrogen atom, the rest of the energy appears an another photon moving in the same direction as the incident photon. Neglecting the light emitted by the excited hydrogen atoms in the direction of the incident beam, what wavelengths may be observed in the transmitted beam? (b) A radition detector is placed near the gas to detect radiation coming perpendicular to the incident beam. Find the wavelength of radiation that may be detected by the detector.

A beam of mixture of alpha particle and protons are accelerted through same potential difference before entering into the magnetic field of strength B. if r_1=5 cm then r_2 is

A beam of mixture of alpha particle and protons are accelerted through same potential difference before entering into the magnetic field of strength B. if r_1=5 cm then r_2 is

Fig. 12.8 shows a mixed source R of alpha and beta particles in a thick lead walled container. The particles pass through a magnetic field in a direction perpendicular to the plane of paper inwards as shown by x. (a) Show in the diagram how the particles get affected. (b) Name the law used in part (a). [Hint : alpha particles will deflect to the left while beta particles to the right]

A beam of alpha -particles passes undeflected through crossed electric and magnetic fields with E = 6.6 xx 10^6 Nc^-1 and B = 1.2 tesla. The speed of alpha -particles is