Electromagnetic waves do NOT require a medium to transmit the pulse energy?   Group of answer choices True False

What are the wavelengths of (a) X-rays of frequency 2.01017 Hz? (b) Yellow light of frequency 5.11014Hz ? (C) Gamma rays of frequency 1.01023Hz ?

The Sun’s energy strikes Earth at an intensity of 1.37kW/m2 . Assume as a mode! approximation that all of the light is absorbed. (Actually, about 30% of the light intensity is reflected out into space.) (a) Calculate the total force that the Sun’s radiation exerts on Earth. (b) Compare this to the force of gravity between the Sun and Earth. Earth’s mass is 5.9721024 kg.

A spherical interplanetary grain of dust of radius 0.2 m is at a distance r1 from the Sun. The gravitational force exerted by the Sun on the grain just balances the force due to radiation pressure from the Sun's light. (i) Assume the grain is moved to a distance 2r1 from the Sun and released. At this location, what is the net force exerted on the grain? (a) toward the Sun (b) away from the Sun (c) zero (d) impossible to determine without knowing the mass of the grain (ii) Now assume the grain is moved back to its original location at r1, compressed so that it crystallizes into a sphere with significantly higher density, and then released. In this situation, what is the net force exerted on the grain? Choose from the same possibilities as in part (i).

An electromagnetic wave has a frequency of 12 MHz. What is its wavelength in vacuum?

A radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?

A small helium-neon laser has a power output of 2.5 mW What is the electromagnetic energy in a 1.0-m length of the beam?

E1ecmagnedc radiation from a 5.00-mW laser is concentrated on a 100-mm2 area. (a) What is the intensity in W/m2? (b) Suppose a 2.00-nC electric charge is in the beam. What is the maximum electric force it experiences? (C) If the electric charge moves at 400 m/s, what maximum magnetic force can it feel?

A plane electromagnetic wave of frequency 20 GHz moves in the positive y-axis direction such that its electric field is pointed along the z-axis. The amplitude of the electric field is 10 V/m. The start of time is chosen so that at t = 0, the electric field has a value 10 V/m at the origin. (a) Write the wave function that will describe the electric field wave, (b) Find the wave function that will describe the associated magnetic field wave.

Electromagnetic waves in certain wavelength ranges interact with water molecules because the molecules have a large electric dipole moment. The electric field of the waveA. Exerts a net force on the water molecules.B. Exerts a net torque on the water molecules.C. Exerts a net force and a net torque on the water molecules.