APPLIED PHYSICS AND ELECTROMAGNETICS

premopremo remo · 75問 · 2年前

通報

問題一覧

What is the SI unit of thermodynamic temperature?

kelvin

Prefix "peta" refers to

10 to the positive 15th power

Relative dielectric strengths of gases tend with increasing molecular weight?

upward

An electron strikes the screen of a cathode ray tube with a velocity of 10 to the 9th power cm/sec Compute the kinetic energy in ergs. The mass of electron is 9\times10 to the negative 31 power kg.

4.5 x 10 to negative 10th power

What is the root-mean-square velocity of H₂ molecules in cm/sec?

1.923×10^5

Which of the following is the usual geometric view factor for a black body?

one

A plane wall is 2 m high by 3 m wide and is 20 cm thick. It is made of a material which has thermal conductivity of 0.5~W/m^{2}-K temperature difference is 60^{\circ}C on two large faces. Find the heat flux.

150 W/m^2

Find the speed of sound in 32^{\circ}F water if the compressibility is 3.4\times10^{-6}psi^{-1}

4,674 ft/sec

It is the maximum frequency, which the human ear can hear.

20,000 Hz

Loudness of sound proportional to the square of

amplitude

The siren of a stationary fire engine has a frequency of 500 Hz, a car drives away from it at 20 m/sec. What frequency does the person in the car hears now? take velocity of sound in still air 343 m/sec.

471 Hz

Electromagnetic waves are refracted when they

pass into a medium of different dielectric constant

When viewed vertically a fish appears to be 3 meters below the surface of a lake Determine the true depth of the fish if the refractive index of water is 1.333?

3.99 m

What is the critical angle for a light passing from diamond to air if the index of refraction of diamond is 2.42?

24 deg

The emission of electrons from matter by electromagnetic radiation of certain energy is

Photoelectric effect

The ratio of electric flux density to electric field intensity is called medium of the

permittivity

What is the S.I unit of mass?

kilogram

What is the S.I. unit of time?

second

What prefix refers to 10 to the negative 18th power?

atto

The physical relationship of gaseous system is treated by_________ of gases in which thier properties are related to P, T and V of system

Kinetic theory

What is the branch of Physics that deals with the dynamic property of gases?

Pneumatics

The molecular diameter of CO is 3.19 x10 to the negative 8, at 300K and pressure of 100 mm Hg. What is the mean free path of the gas in cm?

6.86×10 to the negative 3rd power

A lamp is suspended from a high ceiling with a cord 12 ft long. Find its period of oscillation

3.85 sec

A turning fork makes 284 Vib/sec in air Compute the wavelength of the tone emitted at 25°C. Take speed of sound as 331 m/sec at 0°C

1.22 m

A horizontal cord 6 m long has a mass of 3.5 grams. What must be the tension in the cord if the wavelength of a 120 Hz wave on it is to be 60 cm?

3.02 N

The speed of compressional waves in a metal rod is 6,000 m/sec. What is the Young's modulus of elasticity for the material of the rod if the density of the material is 8.2g/cm³?

2.952x10^11 Pa

A string vibrates in 5 segments to a frequency of 460 Hz. What frequency will cause it to vibrate in 2 segments?

184 Hz

A steel wire 2 meters long has a mass of 20 grams and is stretched with a tension of 1000 Newton. What is the velocity of propagation of a transverse wave in the wire? Assume the linear density of steel at 0.01 kg/m.

316 m/sec

What is the speed of sound through compressed water (100 kPa) if its volume decreased by 0.005% of its original volume

1414 m/sec

What is the average velocity of a nitrogen molecule at 20°C?

470.8 m/sec

A plane wall is 2 m high by 3 m wide and is 20 cm thick. It is made of a material which has thermal conductivity of 0.5 W/m²-K temperature difference is 60°C on two large faces. Find the heat flow.

900 J/sec

What is the rms velocity of oxygen at 70°F?

479 m/sec

A car moving 20 m/sec with its horn blowing at fo = 1200 Hz is chasing another car going at 15 m/sec. What is the apparent frequency of the horn as heard by the driver being chased? Take the speed of sound to be 340 m/sec.

1,219 Hz

In a certain room, one person that is talking has an approximate average level of 40 dB. Assuming that each person speaks the same level as did the single. What will be the sound level when 30 people speak simultaneously?

55 dB

A light ray is incident at an angle of 45 deg. On one side of a glass plate of index of refraction 1.75. Find the angle at which the ray emerges from the other side of the plate

23.83 deg

A plano-convex lens has a focal length of 30

16.5 cm

A meniscus lens has a convex surface whose radius of curvature is 20 cm and concave surface whose radius of curvature is 10 cm. If the index of refraction is 1.55, what is the focal length of the lens?

-36.36 cm

The particle inside the nucleus is called

nucleons

What do you call the nucleus a specific isotope of an element?

nuclide

If one gram of matter could be converted entirely to energy, what would be the value of the energy so produced in kWh ?

25×10^8

How much energy is released when four 1.008145 amu (atomic mass unit) particles fuse into one 4.00387 amu particle?

26.8 MeV

At what speed must a particle move in order to double its mass?

2.6×10^8 m/sec

An X-ray tube emits X-rays whose frequency 1.5 x1019 Hz. What is the operating voltage of the tube?

62.12 kVolt

When the distance between two charges is doubled, the force between then will be equal to

One fourth

Which of the following laws of electromagnetic theory is connected with the force experienced by two loops of a wire carrying a current

Ampere's Law

__________ is a scalar quantity.

Potential in electric field

Find the force on a +100 µCoul charge at (0, 0, 3)m, if four like charges of +20 Coul are located on the x and y axes ± 4m.

1.73 az Newton

What is the flux crosses the closed surface which contains a charge distribution in the form of a plane disk of radius 4m with a density ps = Coul/m²?

2π Coul

A uniform sheet charge with ps = (1/3) nCoul/m² is located at z = 5m and uniform line charge with p = (-25/9) nCoul/m at Z=-3m, Find Eat (x, -1, 0)m.

14.42 volts/m

Steepness of the travelling waves in transmission line is attenuated by of the line.

resistance

The electric field between two concentric cylindrical conductors atr = 0.01 m and r = 0.05 m is given by E = (10/r) ar (Volts/m), fringing neglected. Find the energy stored in a 0.5 m length. Assume free space

0.224 Joule

A long straight steel metal rod has a radius of 5 cm and a line charge density of 30 nCoul/m. Find the electric field 100 cm from the axis of rod. The distance measured is perpendicular to the axial rod.

567.9 V/m

The absorption of radio waves by the atmosphere depends on which of the following?

their frequency

The polarization of dielectric material results in

Creation of electric dipoles

Polarization of an electromagnetic wave is

the direction of its electric filed component with respect to ground

A plane electromagnetic wave travels in a dielectric medium of relative permittivity of 9. Relative to free space, what is the velocity of propagation in the dielectric?

reduced by a factor by of 1/3

In transmission line, the ratio of reflected power to incident power is given by?

r^2

A transmission line having characteristic impedance of 75 ohms is delivering power to a 300-ohm load. What is its Voltage Standing Wave Ratio (SWR)?

4:1

If an SWR (Standing Wave Ratio) of 4:1 exists on a transmission line, what is respective the percentage reflected and absorbed power by the load?

36,64

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