Physics Test-4...

The number of silicon atoms per \(\mathrm{m}^{3}\) is \(5 \times 10^{28}\). This is doped simultaneously with \(5 \times\) \(10^{22}\) atoms per \(\mathrm{m}^{3}\) of Arsenic and \(5 \times 10^{20}\) per \(\mathrm{m}^{3}\) atoms of Indium. Calculate the number of electrons and holes.Given that \(\mathrm{n}_{i}=1.5 \times 10^{16} \mathrm{~m}^{-3}\). Is the material \(\mathrm{n}\)-type or \(\mathrm{p}\)-type?

Average velocity is defined as __________.

An airplane, with \(20 m\) wingspread, is flying at \(250 ms ^{-1}\) parallel to the Earth's surface at a place where the horizontal component of Earth's magnetic field is \(2 \times 10^{-5} T\) and angle of dip is \(60^{\circ}\). The magnitude of the induced emf between the tips of the wings is:

The amplitudes \(E_0\) and \(B_0\) of electric and the magnetic component of an electromagnetic wave respectively are related to the velocity \(c\) in vacuum as:

The electrical energy in kilowatt hours consumed in operating ten \(50 \mathrm{~W}\) bulbs for \(10 \mathrm{hrs} /\) day in a month of \(30\) days is:

Ratio of pressure drop for internal flow through ducts is known as __________.

Human eye ____________.

If a stone of mass m is rotated in a vertical circular path of radius \(1m\), the critical velocity will be: \(g=9.8 m/s ^{2}\)

Which one given below is a non-reducing sugar?

An infinite line charge produces a field of \(9 \times 10^{4} {NC}^{-1}\) at a distance of \(2 {~cm}\). Calculate the linear charge density.