A p-n-p transistor is connected in a common emitter configuration in a given amplifier. A load resistance of 800 ohm is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuit is 192 ohm, the voltage gain and the power gain of the amplifier will respectively be,
3.69,3.84
4,4
4,3.69
4,3.69
Match the corresponding entries of Column 1 with Column 2. [ where m is the magnification produced by the mirror]
Column 1 | Column 2 |
A. m = -2 | a. convex mirror |
B. m = -1/2 | b. Concave mirror |
C. m = +2 | c. Real image |
D. m = +1/2 | d. Virtual image |
A --> a and c; B --> a and d; C --> a and b ; D --> c and d
A --> a and d; B --> b and c; C --> b and d; D --> b and c
A --> c and d; B --> b and d; C --> b and c; D --> a and d
A --> c and d; B --> b and d; C --> b and c; D --> a and d
D.
A --> c and d; B --> b and d; C --> b and c; D --> a and d
A concave mirror forms real and virtual image, whose magnification can be negative or positive depending upon the position of the object.
If object is placed between focus and pole the image obtained will be virtual and its magnification will be positive. In all other cases concave mirror forms real images whose magnification will be negative.
A convex mirror always forms a virtual image whose magnification will always be positive.
An electron of mass m and a photon have the same energy E. The ratio of de-Broglie wavelength associated with them is,
When an alpha particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on mass as,
m
m
The angle of incidence for a ray of light at a refracting surface of a prism is 45o. The angle of prism is 60o. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are
30o,
45o ;
30o;
30o;