Electromagnetic waves Questions and Answers

A photon has 5.70 eV of energy. What is the photon's wavelength? (h = 6.626 x 10-19, 1 eV = 1.6 x 10-¹⁹ J) 218 nm 428 nm 345 nm 677 nm

8. _______ showed that light particles are bundles of electromagnetic energy. Heisenberg Bohr Oppenheimer Planck

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass mis placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

During normal beating, the heart creates a maximum 4.20-mV potential across 0.270 m of a person's chest, creating a 1.00-Hz electromagnetic wave. (a) What is the maximum electric field strength created? V/m (b) What is the corresponding maximum magnetic field strength in the electromagnetic wave? T (c) What is the wavelength of the electromagnetic wave? m

You've entered the Great Space Race. Your engines are hearty enough to keep you in second place. While racing, the person in front of you begins to have engine troubles and turns on his emergency lights that emit at a frequency of 5.510 x 10^14 Hz. If the person in front of you is traveling 2608 km/s faster than you when he turns on his lights, what is the frequency of the emergency lights that you observe when it reaches you in your spaceship? (Enter your answer to four significant figures.) Hz

Be sure to review Example 23.3 before attempting these problems. A sinusoidal electromagnetic wave is traveling in the + direction. It has a period of 2 μs, and its magnetic-field magnitude is 1 x 10-2 T. Write down the equation for the magnitude of the wave's electric field vector E. Express your answer in volts per meter in terms of t, π and z. Express the coefficients using three signature figures.

The Curiosity Rover has recently landed on Mars and likes to send Twitter updates on its progress. If a tweet is posted 11 minutes after it was sent, how far is Curiosity from Earth? (Assume there is no network lag.)

Mrs. Spencer took out a loan to pay for a car. She was required to pay 12.25% interest, compounded monthly, on the unpaid balance of her loan. She borrowed $20,000 and made no payments for five years. How much did she owe at the end of five years (with interest added)?

Tony uses the device shown in the diagram to model how an electromagnet is used in his uncle’s scrap metal yard. After picking up several staples with the device, what change would enable Tony to drop the staples in the scrap metal bin? removing the battery removing the iron nail moving the wire loops closer together spreading the wire loops farther apart

Light Wavelength, Frequency, and Colors: Of the six colors of the spectrum (ROYGBIV), which color represents a light wave with the highest frequency? Which color represents a wavelength withthe greatest wavelength? Which color represents a wavelength with the greatest energy? If the wavelength of a light wave is doubled, does the frequency increase or decrease, and by what factor?

As you sit in a fishing boat, you notice that 12 waves pass the boat every 45 s. If the distance from one crest to the next is 5.0 m, what is the speed of these waves? 3.8 m/s .1 m/s 2.8 m/s 1.3 m/s

Question 13 In a double-slit experiment, it is observed that the distance between two adjacent maxima on a screen is 2 mm. What happens to the distance between adjacent maxima when the wavefength of light is reduced by half (i.e., the wavelength is smaller by a factor of 2)? The distance decreases to about 1 mm The distance remains at about 2 mm The distance increases to about 4 mm

Which of the following examples best illustrates intrinsic motivation? Select the best answer. Ursula knits because she enjoys creating things. Audrey plays on the college tennis team in order to keep her scholarship. Mitchell practices running in hopes of winning a medal for his speed.

Identify the statement about metabolism and body weight that is false. Select the best answer. Our body weight is affected by a number of factors, including gene-environment interactions, and the number of calories we consume versus the number of calories we burn in daily activity. Set-point theory fails to account for the influence of social and environmental factors in the regulation of body weight. Due to its limitations, set-point theory is rarely used as explanation of how body weight is regulated.

For light of wavelength 589 nm, calculate the critical angles for the following substances when surrounded by air.

Radio waves travel at a speed of 300,000,000 m/s. WFNX broadcasts radio waves at a frequency of 101,700,000 Hertz. What is the wavelength of WFNX's radio waves?

What is the maximum electric field strength (in kV/m) in an electromagnetic wave that has a maximum magnetic field strength of 4.50 x 10^-4 T (about 10 times the Earth's)?

Which of these will create EM radiation? (Select all that apply.) A. an AC circuit B. a motionless proton C. an electron moving at a constant speed in a circular path D. a proton moving at a constant speed in a circular path E. an electron moving at constant velocity

From the surface of the Earth we can only observe radiation within certain wavelengths. There are 3 windows of radiation that penetrate the atmosphere and reach the ground. These are the A. Gamma ray window B. X-ray window C. Radio window D. Microwave window E. Visible window F. Infrared window G. Ultraviolet window

A radio antenna broadcasts a 1.0 MHz radio wave with 25 kW of power. Assume that the radiation is emitted uniformly in all directions. (= 8.85 × 10^-12 C²/ N.m², c = 3.00 × 108 m/s) What is the wave's intensity 35 km from the antenna? (Express your answer in watts per meter squared to two significant figures.) What is the electric field amplitude at this distance? (Express your answer in volts per meter to two significant figures.)