A particle of mass M at rest decays into two masses m1 and m2 with non zero velocities. The ratio of de-Broglie wavelengths of the particles is
1 : 1
If elements with principal quantum number n > 4 were not allowed in nature, the number of possible elements would have been
32
60
64
4
In photoelectric effect, the number of electrons ejected per second is
proportional to the wavelength of light
proportional to the intensity of light
proportional to the work function of the metal
proportional to the frequency of light
Half-life of a radioactive substance is 20 minutes. The time between 20% and 80% decay will be
40 minutes
20 minutes
25 minutes
30 minutes
A hypothetical radioactive nucleus decays according to the following series.
If the mass number and atomic number of A are respectively 180 and 72. Then the atomic number and mass number of A will respectively be
69, 171
70, 172
68, 172
69, 172
Nucleus A is converted into C through the following reactions
A and B are isotopes
A and C are isobars
A and B are isobars
A and C are isotopes
If m, mn , and mp are the masses of ZXA nucleus, neutron and proton respectively
m = (A − Z)mn + Zmp
m < (A − Z)mn + Zmp
m > (A − Z)mn + Zmp
m = (A − Z)mp + Zmn
The electrical circuit used to get smooth DC output from a rectifier circuit is called
filter
oscillator
logic gates
amplifier
In the case of constants α and β of a transistor
α = β
β < 1, α > 1
αβ = 1
β > 1, α < 1
D.
β > 1, α < 1
In case of constants α and β of transistor
α < 1 and β > 1