Page 8 - Fizzy Science Corner

85. What is the ratio of specific charges of an á-particle to that of a proton? ​– 1/2
85. Long distance short-wave radio broad casting uses which waves? – ​Ionospheric wave
86. Which satellite is used in ship-to-shore and shore-to-shore and shore-to-ship communication? –
Marisat
87. Which is electrical circuits used to get smooth de output from a rectified circuit called? – ​Filter
88. When the temperature of semiconductor is increased, what will happen in its electrical conductivity? –
Increases
89. With the rise of temperature, what will happen in the specific resistance of semiconductor? –
Decreases
90. The absorption of radio waves by the atmosphere depends on which thing? – ​Their frequency
91. Which are the space waves are affected seriously by atmospheric conditions? ​– UHF
92. With which can Radio wave of constant amplitude be generated? – ​Oscillator
93. What is the electrical circuit used to get smooth DC output from a rectifier circuit called? – ​Filter
94. If germanium has to be doped with a donor impurity, how should the foreign atom be? – ​Pentavalent
95. In a p-type semiconductor, Which are the majority charge carriers? – ​Holes
96. The unidirectional property of a pn-junction is useful for its use as which thing? – ​Rectifier
97. Which energy of the electron at absolute zero is called? – ​Fermi energy
98. For television broadcasting, what frequency is employed normally? – ​30-300 MHz
99. A zener diode is also a p – n junction diode. It can be used as which regular?​ – DC voltage regulator
100. Which effect shows particle nature of height? – ​Photoelectric effect