What are the wavelengths of (a) X-rays of frequency 2.0 × 1017 Hz? (b) Yellow light of frequency 5.1 × 1014 Hz? (c) Gamma rays of frequency 1.0 × 1023 Hz?
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What are the wavelengths of (a) X-rays of frequency 2.0 × 1017 Hz? (b) Yellow light of frequency 5.1 × 1014 Hz? (c) Gamma rays of frequency 1.0 × 1023 Hz?
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- (a) Suppose a star is 6.42 ✕ 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth (b) The Sun is 1.50 ✕ 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? (c) The Moon is 3.84 ✕ 108 m from Earth. How long (in s) does it take for a radio transmission to travel from Earth to the Moon and back?If gamma rays are higher in energy than infrared light, which of the following are true? Gamma rays travel at the same speed as infrared light. Infrared light has a lower frequency than gamma rays. Infrared light has a longer wavelength than gamma rays. a I only b I and II only c II and III only d I, II, and III(a) Suppose a star is 7.61 ✕ 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? years (b) The Sun is 1.50 ✕ 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? minutes (c) The Moon is 3.84 ✕ 108 m from Earth. How long (in s) does it take for a radio transmission to travel from Earth to the Moon and back? s
- What is the frequency of the most intense radiation emitted by your body? Assume a skin temperature of 95°. Group of answer choices 1.81 x 10^13 Hz 6.43 x 10^14 Hz 1.65 x 10^13 Hz 3.18 x 10^14 Hz(a) Suppose a star is 8.59 x 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? years (b) The Sun is 1.50 x 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? minutes (c) The Moon is 3.84 x 108 m from Earth. How long (in s) does it take for a high-intensity laser beam to travel from Earth to the Moon and back?(a) The distance to a star is approximately 4.94 ✕ 1018 m. If this star were to burn out today, in how many years would we see it disappear? years(b) How long does it take sunlight to reach Earth? minutes(c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 ✕ 105 km.) s
- (a) The distance to a star is approximately 4.97 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) S(a) The distance to a star is approximately 5.50 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? 581.35 years (b) How long does it take sunlight to reach Earth? 8.33 minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) X 1.28 Your response differs from the correct answer by more than 10%. Double check your calculations. SRadiation from a distant neutron star is found by a satellite far from Earth to have wavelength λ = 3 nm. a) What is the ratio δλ/λ, where δλ is the difference with respect to the measurement by a detector on the surface of the Earth? The Schwarzschild radius of the Earth is 8.7 mm, while its actual radius is 6.4 × 106 m. b) What is the ratio δ′ λ/λ, where δ′ λ is the difference with respect to the wavelength of the same radiation at the time of emission from the neutron star’s surface? Assume that the neutron star’s actual radius is three times its (typically 4 km) Schwarzschild radius.
- The frequency of violet light is 7.5 x 1014 Hz. How much energy does a photon of violet light carry? (h = 6.626 x 10-34 J·s; 1 eV = 1.60 x 10-19 J) 5.02 x 10-22 J 4.97 x 10-19 J 2.36 x 10-19J 4.38 x 10-19 J(a) How many minutes does it take a photon to travel from the Sun to the Earth? in minutes (b) What is the energy in eV of a photon with a wavelength of 533 nm? in eV (c) What is the wavelength (in m) of a photon with an energy of 1.03 eV? in metersA certain star is 15.7 million light-years from Earth. The intensity of the light that reaches Earth from the star is 3.40 × 10-21 W/m². At what rate does the star radiate EM energy? x 1026 W