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- A beam of light, traveling at speed 3*108 m/s, has wavelength 420 nm. What is its frequency?A distant star is traveling directly away from Earth with a speedof 49,500 km>s. By what factor are the wavelengths in this star’sspectrum changed?In the “red shift” of radiation from a distant galaxy, the light Hy, known to have a wavelength of 434 nm when observed in the laboratory, appears to have a wavelength of 462nm. What is the speed of the galaxy in the line if sight relative to Earth?
- Scientists are workingon a new technique to kill cancer cells by zapping them with ultrahighenergy(in the range of 1012 W) pulses of light that last for an extremelyshort time (a few nanoseconds). These short pulses scramble the interiorof a cell without causing it to explode, as long pulses would do. We canmodel a typical such cell as a disk 5.0 mm in diameter, with the pulselasting for 4.0 ns with an average power of 2.0 * 10^12 W. We shall assumethat the energy is spread uniformly over the faces of 100 cells foreach pulse. (a) How much energy is given to the cell during this pulse?(b) What is the intensity (in W/m2) delivered to the cell? (c) What arethe maximum values of the electric and magnetic fields in the pulse?A radio station broadcasts at a frequency of 600 kHz. Knowing thatradio waves have a speed of 3 y 10^8 m/s. what is the wavelenath ofthese waves.Radio-controlled clocks throughout the United States receivea radio signal from a transmitter in Fort Collins, Colorado,that accurately (within a microsecond) marks the beginningof each minute. A slight delay, however, is introducedbecause this signal must travel from the transmitter to theclocks. Assuming Fort Collins is no more than 3000 km fromany point in the U.S., what is the longest travel-time delay?
- A signal from of PLDT-Fibr travels through its optic cable at the speed of (2x108 m/s).a.) How long will it take for the signal to travel from our house to LJ’s house which has a30.35 km distance b.) What length in inches of the optic cable represents 0.75 ms(millisecond)?What is the wave length, in nm, of a light wave with a frequency of 4*10^15 Hz?Given once SpaceX's StarLink can provide global internet by sending light between satellites in space, what is the expected time delay for a Whatsapp call from Indianapolis to London which is about 6416 km apart? In other words, how long does light need to travel between Indianapolis and London? µs = 1 × 10¬°s, ms = 1 × 10¬³s tdelay = 2.14µs tdelay = 2.14ms %3D tdelay = 214µs O tdelay = 2.14s %3D
- At what speed must a human weighing 150.0 lb be traveling in order to have a wavelength at 650 nm?A light shines from the top of a pole 50 ft high. A ball is dropped from the same height from a 1 point 30 ft away from the light. How fast is the shadow of the ball moving along the ground sec 2 later? (Assume the ball falls a distance s = 16t² in t sec.) The shadow is moving at a velocity of (Type an integer or a decimal.) ft/sec. 50-ft pole 0 30 Ball at time t=0 1 2 sec later Shadow X x(t)(b) Calculate the output Vout across points C and D in Fig. Q1(b). R1 802 R3 4802 100V i Vout D R2 1202 R4 1602 Fig. Q1(b)