During a flare-up froma sunspot, X-rays (electromagnetic waves) are emitted. If the distance between the sun and the earth is 1.50 x 1011 m, how long (in minutes) does it take for the X-rays to reach the eart

A common short-wave radio broadcast band has a wavelength of 49m.  What is its frequency?

The incident radiation on the earth's surface can be approximated by Ii = In cos 0, where In = 80 W/m2. sr is the total radiation intensity directed perpendicular to the surface. What is the total irradiation at the surface of the earth?

1 ô'z is the mean value of E. Using this result and the definition of o = E² - (E)'. z oß Show that E?

(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

Processes at the center of a nearby galaxy cause the emission of electromagnetic radiation at a frequency of 3.05 × 1013 Hz. Detectors on Earth measure the frequency of this radiation as 2.39 × 1013 Hz. How fast is the galaxy receding from Earth? speed of recession: m/s

(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 message was sent from Mars to Earth. Mars is approximately 54.6 million kilometers away from the earth. If the message was sent via radio waves at 4:38:00 AM (PHT) at what time (PHT) will it be received here on earth?

A distant galaxy emits light that has a wavelength of 711.2 nm. On earth, the wavelength of this light is measured to be 714.9 nm. (a) Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give your answer to 4 significant digits. Use 2.998 × 108 m/s as the speed of light.) (a) The galaxy is receding (b) Number i 2.2541 x 10^6 ✓from the earth. Units m/s

The distance from the Earth to the moon is 239,000 miles. The distance from the Earth to the moon is 385000 km. Given that light travels at 3.00 × 10⁸ m/s how many minutes does it take for light to travel to the moon?