Other Physics Answers

1. Radio waves from an FM station have a frequency of 110 MHz. If the waves

travel with a speed of 3.00 x10^8 m/s, what is the wavelength?

Answer Options:

1- 2.91 m

2- 2.73 m

3- 3.3 x 10^16 m

4- 2.73 x 10^6 m

2.Calculate the frequency of an 18 m wave travels at 288 m/s.

Answer options:

1- 16 Hz

2- 28.8 Hz

3- 4 Hz

4- 205 Hz

3.A wave that is produced by a series of continuous pulses is a

_______________ wave.

Answer Options:

1- periodic

2- continuous

3- pulse

4- compression

If 300cm3 of hydrogen diffuses through a porous pot in 50seconds. How long will it take 500cm3 of hydrogen to diffuse through the same pot. (Hydrogen=1,oxygen=16)

An infinite line carries a linear uniform charge density of 19.6 nC/m). Determine the magnitude of the electric field ( in units of kN/C) at a distance of 5.0 cm from the line.

An object’s weight is the force that Earth’s gravity exerts on it. If a 40 N box falls from an airplane, what is the magnitude and direction of the force the object exerts on Earth?

How much work is done by a student who lifts a 30 kg barbell 1.2 m?

A plane-parallel capacitor has circular plates of radius r = 10 cm, separated by a distance d =1 mm. How much charge is stored on each plate when their electric potential difference has the value V = 100 V?

Indicate on an energy level diagram the conduction and valence bands, donor and acceptor states and the position of Fermi level for (i) an intrinsic semiconductor. (ii) a n-type semiconductor. (iii) a p-type semiconductor.  

The electron and hole mobilities in a Si sample are 0.135 and 0.48m2/V-s respectively.  Determine the conductivities of intrinsic Si at 300 K if the intrinsic carrier concentration is 1.5 x 106 atom/m3. The sample is then doped with 1023 phosphorus atom/m3. Determine the equilibrium hole concentration, conductivity, and position of the Fermi level relative to the intrinsic level. 

The conductivity of silver is 6.5 x 107per Ohm per m and number of conduction electrons per m3 is 6 x 1028. Find the mobility of conduction electrons and the drift velocity in an electric field of 1 V/m. Given m = 9.1 x 10–31 kg and e = 1.602 x 10–19 C.