The wavelength of light visible to the human eye is on the order of 6 × 10 −7 m. If the speed of light in air is 3 × 10 8 m/s, find the frequency of the lightwave.

A distant galaxy emits light that has a wavelength of 617.7 nm. On earth, the wavelength of this light is measured to be 623.6 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 (b) Number ◆ from the earth Units ✪

A spacecraft approaching a star at 4.00 E 7 m/s fires a laser at a stationary target. The beam of light has an apparent frequency of 5.04 E 16 hz. What is the wavelength of the light beam that hits the target?  a 1.26 E 9 m  b 5.95 E −9 m  c 7.94 E −10 m  d 8.24 E −9 m

(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 distant galaxy emits light that has a wavelength of 655.6 nm. On earth, the wavelength of this light is measured to be 661.9 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 water wave travelling in a certain direction has a wavelength of 10.5 mm, a speed of 7.1 m/s and an amplitude of 5 mm. Calculate the frequency of the wave.

Electromagnetic waves are traveling in the vacuum of space. Calculate the wavelengths of these electromagnetic waves with the following frequencies. (Enter the first wavelength in pm and the second wavelength in cm.) (a) 8.00 x 1019 Hz pm (a) 5.50 x 109 Hz cm Need Help? Read It

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

What is the intensity in W/m​2​​ of a laser beam used to burn away cancerous tissue that puts 374 J of energy into a circular spot 2.00 mm in diameter in 4.67 s? Compare this to the average intensity of sunlight (about 700 W/m​2​​).   answer blank times 10^7

Starting from Maxwell's equations V × V × A = V(V· A) – V²A | in a vacuum, use the identity and show that the electric and magnetic fields satisfy both the equation of a wave and obtain the speed of that wave in the MKS system.