Physics-
General
Easy
Question
An observer is moving away from a source at rest The pitch of the note heard by the observer is less because
- the pitch of the source decreases
- the velocity of sound in air increases
- wave length of the wave becomes small
- wavelength of the wave remains unchanged but observer receives less number of waves
The correct answer is: wave length of the wave becomes small
Related Questions to study
physics-
A small coil of ‘N’ turns has an area “A” and a current “I” flows through it The magnetic dipole moment of this coil will be ...
A small coil of ‘N’ turns has an area “A” and a current “I” flows through it The magnetic dipole moment of this coil will be ...
physics-General
physics-
A conductor AB of length “ 
” carrying current “i ” is placed perpendicular to a long straight conductor XY carrying a current i as shown in the fig The force on AB will act ........
A conductor AB of length “ ” carrying current “i ” is placed perpendicular to a long straight conductor XY carrying a current i as shown in the fig The force on AB will act ........
physics-General
physics-
A circular coil of wire carries a current PQ is a part of very long wire carrying a current and passing close to the circular coil If the directions of currents are those shown in figure, then the direction of the force acting on PQ is ....
A circular coil of wire carries a current PQ is a part of very long wire carrying a current and passing close to the circular coil If the directions of currents are those shown in figure, then the direction of the force acting on PQ is ....
physics-General
physics-
A rectangular loop carrying current I is located near an infinite long straight conductor carrying current I as shown in fig The loop is ....
A rectangular loop carrying current I is located near an infinite long straight conductor carrying current I as shown in fig The loop is ....
physics-General
physics-
Two long wires are joined first in parallel and then in series and they are connected to a battery then, they experience ....
Two long wires are joined first in parallel and then in series and they are connected to a battery then, they experience ....
physics-General
physics-
A long current carrying wire “W” is free to move when placed in a magnetic field “B” at right angles to the field as shown in figure Then it will move ...
A long current carrying wire “W” is free to move when placed in a magnetic field “B” at right angles to the field as shown in figure Then it will move ...
physics-General
physics-
An electron is accelerated through a potential difference of 100 volt and then enters a region where it is moving perpendicular to a magnetic field B T = 0.2 The radius of the circular path is cm
An electron is accelerated through a potential difference of 100 volt and then enters a region where it is moving perpendicular to a magnetic field B T = 0.2 The radius of the circular path is cm
physics-General
physics-
The magnitude of the force depends upon the ....
The magnitude of the force depends upon the ....
physics-General
Physics-
A particle of charge Q and mass M moves in a circular path of radius R in a uniform magnetic field of magnitude B. The same particle now moves with the same speed in a circular path of same radius R in the space between the cylindrical electrodes of the cylindrical capacitor. The radius of the inner electrode is R/2 while that of the outer electrode is 3R/2. Then the potential difference between the capacitor electrodes must be
A particle of charge Q and mass M moves in a circular path of radius R in a uniform magnetic field of magnitude B. The same particle now moves with the same speed in a circular path of same radius R in the space between the cylindrical electrodes of the cylindrical capacitor. The radius of the inner electrode is R/2 while that of the outer electrode is 3R/2. Then the potential difference between the capacitor electrodes must be
Physics-General
Physics-
A particle of specific charge (charge/mass) a starts moving from the origin under the action of an electric field 
and magnetic field 
Its velocity at 
The value of x0 is:
A particle of specific charge (charge/mass) a starts moving from the origin under the action of an electric field and magnetic field Its velocity at The value of x0 is:
Physics-General
physics-
OABC is a current carrying square loop an electron is projected from the centre of loop along its diagonal AC as shown. Unit vector in the direction of initial acceleration will be
OABC is a current carrying square loop an electron is projected from the centre of loop along its diagonal AC as shown. Unit vector in the direction of initial acceleration will be
physics-General
physics-
A mass spectrometer is a device which select particle of equal mass. An iron with electric charge q > 0 and mass m starts at rest from a source S and is accelerated through a potential difference V. It passes through a hole into a region of constant magnetic field 
perpendicular to the plane of the paper as shown in the figure. The particle is deflected by the magnetic field and emerges through the bottom hole at a distance d from the top hole. The mass of the particle is
A mass spectrometer is a device which select particle of equal mass. An iron with electric charge q > 0 and mass m starts at rest from a source S and is accelerated through a potential difference V. It passes through a hole into a region of constant magnetic field perpendicular to the plane of the paper as shown in the figure. The particle is deflected by the magnetic field and emerges through the bottom hole at a distance d from the top hole. The mass of the particle is
physics-General
Physics-
A charged particle moves in a magnetic field 
with initial velocity 
The path of the particle will be
A charged particle moves in a magnetic field with initial velocity The path of the particle will be
Physics-General
Physics-
An electron having kinetic energy T is moving in a circular orbit of radius R perpendicular to a uniform magnetic induction If kinetic energy is doubled and magnetic induction tripled, the radius will become
An electron having kinetic energy T is moving in a circular orbit of radius R perpendicular to a uniform magnetic induction If kinetic energy is doubled and magnetic induction tripled, the radius will become
Physics-General
physics-
Two long conductors are arranged as shown above to form overlapping cylinders, each of raidus r, whose centers are separated by a distance d. Current of density J flows into the plane of the page along the shaded part of one conductor and an equal current flows out of the plane of the page along the shaded portion of the other, as shown. What are the magnitude and direction of the magnetic field at point A?
Two long conductors are arranged as shown above to form overlapping cylinders, each of raidus r, whose centers are separated by a distance d. Current of density J flows into the plane of the page along the shaded part of one conductor and an equal current flows out of the plane of the page along the shaded portion of the other, as shown. What are the magnitude and direction of the magnetic field at point A?
physics-General
