Physics Test - ...

An element X decays first by positron emission and then 2 -particles are emitted in succession. If the product nucleus as mass number 229 and atomic number 89, the mass number and atomic number of element ‘X’ are

When a light of photons of energy 4.2 eV is incident on a metallic sphere of radius 10 cm and work function 2.4 eV, photo electrons are emitted. The number of photo electrons liberated before the emission stopped is _________x 10⁸.

To travel through the same distance in two different media, a light ray of certain frequency takes different times which are in the ratio 3: 5, the relative refractive index is

The displacements of two interfering light waves are y₁ = 4 sin( t) and y₂ = 3cos ( t).

The amplitude of the resultant wave is: (where y₁ and y₂ are in CGS system)

In a magnetic filed of induction 0.9 Wb /m² a linear conductor of 0.4 meter length is moving with a velocity of 7 m/s. The value of maximum induced emf will be

From the circuit shown below, the maximum and minimum values of Zener diode current are

For a logic 0101 the waveform is

Consider a car moving on a straight road with a speed of 100 m/s.  The distance at which car can be stopped is [μ_k = 0.5, g = 10ms^-2]

For a common base amplifier, the values of ratio of output & input resistances and voltage gain are 3000 and 2800 respectively. The current gain will be

For a television network, 5 × 10⁵ channels are granted. If the central frequency of the microwave link is 25 GHz and the allotted bandwidth for each channel is 2 kHz, how much percentage of the link is used for the network?