There is a simple relationship between the energy for a photon of light ephoton in units of ev (electron volts) and its wavelength λ in nm (nanometers) given by: ephoton (ev) = (1240 ev nm) / (λ nm). for example, if light has a wavelength of 620 nm, then its energy ephoton = (1240 ev nm) / (620 nm) = 2 ev. visible light has photon energies of ~1.7 to 3 ev and wavelengths of ~400 to 750 nm (λblue = 475 nm, λgreen = 510 nm, λyellow = 570 nm, and λred = 650 nm).
what is the wavelength λ in nm for light with a photon energy ephoton = 2 ev?
what is the photon energy for light with a wavelength λ = 630 nm?
in the electromagnetic spectrum, x-rays have much higher photon energies (~100 to 100,000 ev) and shorter wavelengths (~0.01 to 10 nm) than visible light. what is the photon energy for an x-ray with a wavelength λ = 6 nm?
Answers: 2
Physics, 22.06.2019 01:20
Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.
Answers: 3
Physics, 22.06.2019 03:30
Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)
Answers: 1
Physics, 22.06.2019 14:40
The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.
Answers: 1
Physics, 22.06.2019 22:20
Which symbol in the first law of thermodynamics represents the sum of the chemical and thermal energy stored in atoms and molecules? a. q b.w c.v d.u
Answers: 3
There is a simple relationship between the energy for a photon of light ephoton in units of ev (elec...
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