Electricity and Magnetism Answers

Sodium has a work function of 2.36eV. If a beam of monochromatic 442-mm light is incident upon a sample sodium, will electrons be ejected? At what speed?

Explain what you understand by the apparent magnitude of a star. How is it related
to the brightness of the star? An object A has an apparent magnitude of –5. Another
object B has an apparent magnitude of –10. Calculate the ratio of their brightness

Explain the structure of a CCD camera. How are colour signals obtained using a
CCD camera?

Explain with the help of appropriate diagrams the difference between a microware
circulator and directional coupler.

A metal has Er= 9, Wp=7×10^15 rad s^-115, v=2×10^12 s^-1 . Calculate the skin depth for microwave of 4 cm vacuum wavelength.

our galaxy is about 15 light years across and most energetic particles transversing it have energies of about 10^20 ev find the relativistic energy of the partical assuming it in a proton
1)16J
2)15J
3)10J
4)0J

Explain the Shell Model of the atomic nucleus.

At what potential difference must an X-ray tube operate to produce X-rays with a
minimum wavelength of 2A. °

what is the period of the radio wave generated by 93 Q (92.9 MHz) ?

conductor possesses a positive charge of 3.2x 10^-19 C. How many electron does it have in excess or deficit (e = 1.60 x 10^-19C)