The ratio of the de-Broglie wavelength of an α-particle and a proton of same kinetic energy is
1 : 2
1 : 1
4 : 1
Which of the following is not conserved in nuclear reaction ?
Total energy
Mass number
Number of fundamental particles
Nucleon number
The number of α-particles and β-particles respectively emitted in the reaction 88A196 → 78B164 are
8 and 8
8 and 6
6 and 8
6 and 6
The counting rate observed from a radioactive source at t = 0 s was 1600 count/s and at t = 8 s it was 100 counts/s. The counting rate observed as counts per second at t = 6 s, will be
400
300
250
200
D.
200
If De, Db and Dc are the doping levels of emitter, base and collector respectively of a transistor, then
De = Db = Dc
De < Db = Dc
De > Dc > Db
De < Db < Dc
A p-n junction in series with a resistance of 5 km is connected across a 50 V DC source. If the forward bias resistance of the junction is 50 Ω, the forward bias current is
8.8 mA
1 mA
9.9 mA
20 mA
A transistor connected at common-emitter mode contains load resistance of 5 kΩ and an input resistance of 1 kΩ. If the input peak voltage is 5 mV and the current gain is 5O, find the voltage gain
250
500
125
50
If n1 and n2 are the refractive indices of the core and the cladding respectively of an optic fibre, then
n1 = n2
n1 < n2
n2 < n1
n2 = 2n1
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high
fidelity
distortion
sensibility
sensitivity