1. Our eyes are most sensitive to light with a wavelength of 550nm. Find the temperature of a black-body radiator whose radiation is most visible to the eye.
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
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- 6. Match the description of a process with the corresponding arrow in the figure: a. Absorption of a photon whose energy is E₁ - Eo. E3 b. Absorption from an excited state (a rare event at ordinary temperatures). E2 c. Emission of a photon whose energy is E3 - E₁. d. Emission of a photon whose energy is E₂ - Eo. e. In drawing arrows to represent energy transitions, which of the following statements is correct? i. It doesn't matter in which direction you draw the arrow as long as it connects the initial and final states. E₁ ii. For emission, the arrow points down. iii. For absorption, the arrow points up. iv. The tail of the arrow is drawn on the initial state. Eo v. The head of the arrow is drawn on the final state. vi. It is not necessary to draw an arrowhead.41. The wavelength A of de Broglie waves associated with an electron (mass m, charge e) accelerated through a potential difference of V is given by (h is Planck's constant) (a) 2= h/mV (b) 1= h/2 me (c) 2= h/ JmeV (d) 2= h//2meV %3D %3DSuppose a star with radius 8.51 108 m has a peak wavelength of 689 nm in the spectrum of its emitted radiation. (a) Find the energy of a photon with this wavelength. J/photon(b) What is the surface temperature of the star? K(c) At what rate is energy emitted from the star in the form of radiation? Assume the star is a blackbody (e = 1). W(d) Using the answer to part (a), estimate the rate at which photons leave the surface of the star. photons/s
- A homogeneous pulley with two grooves consists of two wheels which turn together as one around the same axis. The moment of inertia of the two wheels together is ICM = 40 kg m2. The radii are: R1 = 1.2 m and R2 = 0.4 m. The masses that hang on both sides of the pulley are m1 = 36 kg and m2 = 12 kg. We will assume that the masses of the ropes are negligible. Determine the angular acceleration of the pulley, acceleration of the masses, and the tensions of the ropes.The blackbody radiation emitted from a furnace peak at a wavelength of 5.0 10-6 m (0.0000050 m). What is the temperature inside the furnace? K2. Photo-electric effect. when two ultraviolet beams of wavelengths A1 = 80 nm and A2 = 110 nm fall on a lead surface, they produce photoelectrons with maximum energies 11.390 eV and 7.154 eV, respertively. a) Estimate the numerical value of the Planck constant. (b) Calculate the work function, the threshold frequency and the threshold wave-length of lead.
- The blackbody radiation emitted from a furnace peaks at a wavelength of 3.3 10-6 m (0.0000033 m). What is the temperature inside the furnace In K?An object at an initial temperature of 27 degrees C is raised to a temperature of 877 degrees C. How much more energy does the object emit as blackbody radiation at the higher temperature compared to the lower temperature? a. 32.5 b. 215.9 c. 864.5 d. 1,113,1232. Which of the following is not true for Blackbody radiation? a. The power spectrum demonstrates the ultraviolet catastrophe b. The maximum power occurs a shorter wavelength for rising T c. The power spectrum demonstrates the existence of quanta of energy E= hv d. The radiated power decreases as the wavelength becomes very short for fixed T
- 7. If x-ray photons with intensity of 10 W/m2 of energy 70 keV travels through 3 cm of skeletal muscle: (a) What will the intensity of the photon be at the exit of the muscle? (b) If it travels another 10 cm in air before reaching a detector, what is the intensity of the photon at the detector?The blackbody radiation emitted from a furnace peaks at a wavelength of 4.9 10-6 m (0.0000049 m). What is the temperature inside the furnace?1. Suppose that light of total intensity 1.0 W/cm2 falls on a clean iron sample 1.0 cm2 in area. Assume that the iron sample reflects 96% of the light and that only 3.0% of the absorbed energy lies in the violet region of the spectrum above the threshold frequency.(a) What intensity is actually available for the photoelectric effect?(b) Assuming that all the photons in the violet region have an effective wavelength of 250nm, how many electrons will be emitted per second?(c) Calculate the current in the phototube in amperes.(d) If the cutoff frequency is ?0 = 1.1 1015 Hz, find the work function, ?, for iron(e) Find the stopping voltage for iron if photoelectrons are produced by light with 250 nm. 2. (a) Show that the spread of velocities caused by the uncertainty principle does not have measurable consequences for macroscopic objects (objects that are large compared with atoms) by considering a 100-g racquetball confined to a room 15 m on a side. Assume the ball is moving at 2.0 m/s…