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Q. What are the uses of an electron microscope?
Uses of electron microscope:
(i) It is utilized in the industry to study the surface of metals, structure of textile fibres, composition of paints etc.
(ii) In medicine as well as biology it is used to study virus, and bacteria.
(iii) In Physics it has been utilized in the investigation of atomic structure and structure of crystals in detail.
Q. Illustrate what are the characteristics of dead stars? Answer:- Dead stars are typically cold balls of material in empty space. A teaspoonful of white dwarf substance w
Compared with an atom of atomic weight 12 and atomic number 6, the atom of atomic weight 13 and atomic number 6: (1) Contains more neutrons (2) Contains more electro
It is the degree to which a object is magnetized when placed in a magnetic field. It can also be described as the pole strength per unit cross sectional area of the object or th
Q. Give the basic assumptions made in free electron model of solid. OR Write down basic postulates of Sommerfield's free electron gas model. Show that the number of ene
DC high-current measurement: In common with many simple multimeters, both analogue and digital, the high current range (e.g. 10A) is not only selected using the range selector
What is the net force on a conductor of length l carrying current 'i' when it is situated in a magnetic field of induction B? When is it maximum? State and explain Fleming's l
With the help of a circuit diagram, explain how regenerative feedback is provided in an Hartley oscillator?
Noise: An undesirable and unpleasant sound that makes harmful effects on our auditory system is known as noise.
Displacement: - The modification in position of a body in a particular direction is called as displacement. It is a vector function and its unit in SI system is meter. Distanc
Radar: The term radar is used for radio detection and ranging. Radar having of three types of devices, a transmitter, a receiver and indicator devices. It has very high frequen
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