A spaceship travels faster than light to the nearest star and
turns around and returns home at the same speed, i.e.,
t(A) = 0, x(A) = 0,
and t(B) > 0, x(B) = 0.
Draw this trajectory on a world line diagram. Is there a reference
frame where the traveler arrives before they left, i.e.,
t(B) < t(A)?
Light including the infrared, visible, and ultraviolet hits a
bunch of hydrogen atoms at nearly 0K. The light is detected after
hitting the atoms.
Describe the detected light.
Considering only transitions that allow the electron to remain
bound, determine the longest possible wavelength absorbed.
Considering only transitions that allow the electron to remain
bound, determine the shortest possible wavelength that could be
absorbed.
Determine if either of the photons in (b) or (c) are in the
visible range.
A. What are electromagnetic waves? What is the difference
between visible light and other electromagnetic waves that we
cannot see? Name four electromagnetic waves that we are not able to
see.
B- What is the remnant energy of the Big Bang, called Cosmic
Microwave Background waves (CMB)? How can we say that the universe
is expanding by comparing it to the electromagnetic waves at the
time of the Big Bang?
C- What is the wavelength of red light and blue...
Infrared radiation is also called IR. Describe how it is
different from visible light. What emits IR? Can animals use it?
Explain how emission of IR sometimes “wastes” energy. Give examples
showing how IR is used in modern technology.
Infrared radiation is also called IR. Describe how it is
different from visible light. What emits IR? Can animals use it?
Explain how emission of IR sometimes “wastes” energy. Give examples
showing how IR is used in modern technology.
Consider the following seven types of electromagentic waves:
visible light, microwaves, radio waves, gamma rays, infrared, uv
and x-rays
a) place the waves in order from shortest wavelength to
longest
b)place the waves in order fromm lowest frequency to highest
c) which waves travels with the highest velocity in a vacuum
A light year is the distance light travels in 1 year.
Light travels at 3*108 meters* sec-1.
Write a program that calculates and displays the number of
meters light travels in a year.
In visible light, which color has the longest
wavelength?'
Are Microwave, Visible Light, Gamma rays in order of lowest to
highest energy?
are Radio broadcast, cell phone and GPS examples of technologies
that uses radio waves
5. Find all the wavelengths of visible light emitted when
Hydrogen is heated. Approximate visible light to have the range
from 400 nm to 700 nm. No points for only telling the wavelengths.
Points will be for showing how you found these wavelengths (mention
the transitions).