mastering physics homework answers

. It converts d.c. power into a.c. power. 59. Transistor as an oscillator : 60. A digital circuit is an electronic circuit in which the current and voltage signals have only two levels, either on or off. 61. A digital circuit that follows a certain logical relationship between input and output volt..

) With the increase in the intensity of incident radiation, number of photoelectrons emitted increases and so the photoelectric current increases. 8. Diagram of J J. Thomson's Experiment. 9. Cathode rays are streams of fast moving electrons. 10. 10" 2 to 10" 3 mm of Hg. 11. Three important properti..

1. To reduce the force experienced, by increasing the time of contact. 2. Zero. 3. Because radial component of force does not contribute to torque. 4 - v <=hrJ =c - 5. (a) 6. y = a sin(u; - <(> 0 ). Similar displacement should happen at regular ti..

. Band spectra are emitted by substances in molecular state. A band consists of a large number of close lines. (iii) Continuous spectrum. A continuous spectrum consists of an unbroken sequence of wavelengths (or colours) over a wide range. Continuous spectra are emitted by solids, liquids and highl..

. Thus if I is the luminous intensity of the source and r is its distance from cos 0 P, then E = 5 r D 62. The magnifying power of microscope is given by M 1 + D/fe M is larger when both f g and f e are small. 63. No. 64. Microscope is an optical instrument which is used to magnify small obje..

et. Dividing Eq. (2) byEq. (1), B 1_ T 1 B 2 T] 66. Soft iron has low|Coercivity and small hysteresis loss. It can be easily magnetized and demagnetized. Steel has high coercivity and large hysteresis loss. It cannot be easily magnetized and demagnetized ..

^ .(2) MP PB y ' Eqs. (1) and (2) give - PB' FP+ PB' PB ~ FP v - /+ v or=- -u - / V v- / V or -= = -- 1 111 or + -= u v f 2. Do yourself 3. See short-answer question 38 and ..

. Now the current carrying conductor Q is placed m the magnetic field B, produced by P. Since the conductor Q is placed perpendicular to the magnetic field B the force acting on length lofjQ is given by F = BI 2 1, directed towards P Mo 7 i = / / 2n r - 7 ' 72 / F= ...

1. Bohr's Postulates - see short answer Q. 12. Energy of an electron in the nth orbit Let Z be the atomic number of a hydrogen like atom. Since the electron moves in a circular orbit, the electrostatic force of attraction between the nucleus and the electron provides the ce..

1. A transformer converts a low ac voltage to a high ac voltage or vice-versa. It is based on the principle of mutual induction, i.e., generation of induced e.m.f. in a coil when a changing current flows through a neighbouring coil. Construction: It consists of two ..