Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

When a proton is accelerated with 1 volt potential difference, then its kinetic energy is

(a)

(b) 1840 eV

(c) 1 eV

(d) 1840 c2 eV

Waves in decreasing order of their wavelength are:

If a current increases from zero to one ampere in 0.1 second in a coil of 5mH, then the magnitude of the induced e.m.f. will be.

An arbitrary shaped closed coil is made of a wire of length L and a current I ampere is flowing in it. If the plane of the coil is perpendicular to magnetic field , the force on the coil is

(a) Zero

(b) IBL

(c) 2IBL

(d)

An AC source rated 100V (rms) supplies a current of 10A (rms) to a circuit. The average power delivered by the source:

1. Must be 1000W.
2. May be 1000W.
3. May be greater than 1000W.
4. May be less than 1000W.

Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio:

1. 25 : 1
2. 5 : 1
3. 9 : 4
4. 625 : 1

Charge is the property associated with matter due to which it produces and experiences.

What is the unit of electric potential difference?

With the increase in principle quantum number, the energy difference between the two successive energy levels

(a) Increases

(b) Decreases

(c) Remains constant

(d) Sometimes increases and sometimes decreases

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is

(a) 1.2 mm

(b) 1.2 cm

(c) 2.4 cm

(d) 2.4 mm