i) Recall the Photoelectric effect, if an electron has been accelerated through a potential difference of 100 V then calculate its velocity in m/s.
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- 3. Find the momentum of (a) a 10.0-MeV gamma ray; (b) a 25-keV X ray; (c)a1.0-µm infrared photon; (d) a 150-MHz radio-wave photon. Express the momentum in kg -m/s and eV/c.What is the energy (in Joules, J) and color associated with 532-nm light? Energy and Type of EM Radiation A) 3.74×10-19 J Red (Visible, close to IR range) B) 3.74×10-19 J Violet (Visible, close to UV range) C) 3.74×10-19 J Green (Visible, middle of visible range) D) 3.74×10-28 J Colorless (Radio) E) 2.68×10+18 J Colorless (Gamma)7. Borg ships are cubical. A Borg ship is approaching earth. According to an observer on earth, the Borg ship is 1000 m high, 1000 m wide, and has a depth of 200 m. Earth launches a photon torpedo to destroy the Borg ship. The torpedo is launched from earth with a velocity of 0.99. The torpedo was set on earth to go off in 2 hr. 09 ce 1000 m Earth 200m a) With what velocity is the Borg ship approaching earth? b) What is the speed of the torpedo as measured by an observer on the Borg ship? ) According to an observer on the Borg ship, how long will it take the torpedo to explode?
- Question: The electronic structure of atoms and molecules may be investigated using photoelectron spectroscopy. An electron in a photoelectron spectrometer is accelerated from rest by a uniform electric field to a speed of 420 km s−1 in 10 µs. Determine the kinetic energy of the electron?16. || At what speed is an electron's de Broglie wavelength (a) 1.0 pm, (b) 1.0 nm, (c) 1.0 um, and (d) 1.0 mm?3. Alice is moving with 0.8c towards a mirror. She sends a light pulse towards the mirror when she is at a distance L from the mirror. Bob is at rest with respect to the mirror and is observing this experiment. After how long will Alice receive the reflected pulse, as measured by Alice and Bob?
- II Review I Constants Electromagnetic radiation (known as Cherenkov radiation) is emitted when a charged particle moves through a medium faster then the local speed of light. It should be stressed that the particle is never going faster then the speed of light in vacuum (or c), just faster than the speed of light in the material (which is always less than c). When a charged particle passes straight through a medium faster than the local speed of light, it will emit Cherenkov radiation in a cone. Let's see how the cone angle is correlated to the speed of the particle. Part A If a particle is traveling straight through a material with index of refraction n at a speed v, what is the angle 0 between the vector of the propagating Cherenkov radiation and the vector in the direction of the propagating particle? Express your answer in terms of v, c, and n. • View Available Hint(s) ? Submit Request AnswerWhich one of the following statements is true regarding red photons and blue photons traveling through vacuum? A) Red light travels faster than blue light and carries more energy. B) Blue light travels faster than red light and carries more energy. C) Red light travels at the same speed as blue light and carries more energy. D) Blue light travels at the same speed as red light and carries more energy.When you shine a certain source of EM radiation on a sheet of gold (work function W1 = 5.1 eV), the stopping voltage required to bring all the ejected electrons to a halt is V = 3.5 V. If you were to use this same source of EM radiation on a sheet of potassium (work function W2 = 2.3 eV), what would be the maximum speed of ejected electrons?
- 2. Astronaut A is moving away from Astronaut Bat half the speed of light. Astronaut A turns on and off a laser so that the beam is on for 1.00s as measured by Astronaut A. a. How fast is the light moving in the reference frame of Astronaut B? b. How much time is the beam on as measured by Astronaut B? c. The laser emits a wavelength of 635nm as seen in the reference frame of Astronaut A. What wavelength is observed in the reference frame of Astronaut B?c) Max Planck proposed his constant h to relate the energy of a photon to its frequency. Calculate the energy in eV of red light of wavelength 620 nm.What is the magnitude and direction of electric field for the capacitor below? 150 V OV 3.0 mm 1 I 1 1 1.0 mm 1.0 mm k 1.0 mm