What should be the order of magnitude of the minimum fequency of electromagnetic waves that could be used to detect the presence of a bird 0.1m long?
From what sources of electromagnetic radiation would you be able to generate radiation of these wavelengths?

What should be the order of magnitude of the minimum fequency of electromagnetic waves that could be used to detect the presence of an aircraft 50 m long and

What should be the order of magnitude of the minimum frequency of electromagnetic waves that could be used to detect the presence of the planet venus.

H-atom is exposed to electromagnetic radiation of lambda=1025.6 Å and excited atom gives out induced radiation. What is the minimum wavelength of the induced radiation?

The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hv (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?

A rectangular loop of sides 8 cm and 2 cm with a cut is stationary between the pole pieces of an electromagnet. The magnetic field of the magnet is normal to the loop. The current feeding the electromagnet is reduced so that the field decreases from its initial value of 0.3 T at the rate of 0.02 T s^-1 . If the cut is joined and the loop has a resistance of 1.6 Omega , how much power is dissipated by the loop as heat? What is the source of this power?

Electromagnetic waves with wavelength lambda_1 used in statellite communication. lambda_2 used to kill germs in water purifies. lambda_3 is used to detect leakage of oil in underground pipelines. lambda_4 is used to improve visibility in runway during fog and mist conditions. Arrange these wavelengths in ascending order of their magnitude.

Suppose that the electric field part of an electromagnetic wave in vacuum is E = {(3.1 N//C) cos [(1.8 rad//m) y + (5.4 xx 10^6 rad//s)t]} hati . What is the wavelength ?

Sketch a graph between frequency of incident radiations and stopping potential for a given photosensitive material. What information can be obtained from the value of the intercept of potential axis? A source of light of frequency of greater than the threshold freuency is placed at a distance of 1 m from the cathode of a photocell? the distnace of hte light sources from the cathode is reduced explain giving reasons, what change will you observe in the Stopping potential.