Explanation :
The characteristics of sound waves are as follows :
(1) Intensity : The power per unit area carried by a sound wave is called as the intensity of wave. So, . Its unit is
.
(2) Loudness : Loudness means how the listener perceives the sound intensity. It is determined by the intensity of sound waves.
(3) Frequency : The number of to and fro oscillations of sound wave per unit time is called as its frequency. Its unit is Hz or Hertz.
(4) Pitch : Pitch means the quality of sound. It is closely related to frequency. For high pitch, the number of waves are more.
Answer:
Explanation:
Electron's kinetic energy = 2 eV
= 2 x 1.6 x 10⁻¹⁹ J
1/2 m v² = 3.2 x 10⁻¹⁹
1/2 x 9.1 x 10⁻³¹ x v² = 3.2 x 10⁻¹⁹
v² = .703 x 10¹²
v = .8385 x 10⁶ m/s
Electrons revolve in a circular orbit when forced to travel in a magnetic field whose radius can be expressed as follows
r = mv / Bq
where m , v and q are mass , velocity and charge of electron .
here given magnetic field B = 90 mT
= 90 x 10⁻³ T
Putting these values in the expression above
r = mv / Bq
=
= .052 mm.