Scalar quantities have only magnitude. example temperature, distance.
Vector quantities have magnitude and direction.Example force, velocity.
You can say "I applied a force p\of 3 newtons to the left" but you can't say I added 32 Fahrenheit to the left
Answer:
The time of short pulse of light beam is 
Explanation:
Given that,
A beam of light from a laser illuminates a glass.
Suppose, the length of piece is 
Index of refraction is 2.83.
We need to calculate the speed of light pulse in glass
Using formula of speed

Put the value into the formula


We need to calculate the time of short pulse of light beam
Using formula of velocity


Put the value into the formula


Hence, The time of short pulse of light beam is 
Humans need a digestive system to do cellular respiration, which produces energy used for growth and movement.
Plants do not need one as they make their own energy through photosynthesis. The process produces glucose, which is a form of energy for the plants.
Answer:
The Answer is 0.019998c
Explanation:
Please see the attached Picture for the answer.
Although the green light flashes first, you are moving away from it, so it illuminates you at the same moment as the red light.
A green laser is frequently used by amateur astronomers because its visible beam may be used to point out stars and galaxies because it penetrates the atmosphere so far. Red lasers are less adaptable than green lasers. Each wave or component of light in a laser has been precisely aligned to form a single, strong beam.
Green DPSS lasers are the most popular and first emerged on the market about 2000. (also called diode-pumped solid-state frequency-doubled, DPSSFD). Due to the rarity of laser diodes in this wavelength region, they are more complicated than regular red laser pointers.
Green lasers have been used in head-mounted displays and laser guides for defense and security purposes. Amateur astronomers can also direct and track stars using green laser guides.
To learn more about a green light. Please visit the below link.
brainly.com/question/4503557
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