The owner of a hobby store bought a case of 9-volt batteries for $61.00. He marked the price up such that his profit was $3.75 p
1 answer:
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Answer:
The duration of the movie is longer than 2 hrs.
Explanation:
Given:
The duration of the movie observed by the crew on the spacecraft is 2 hrs.
According to time-dilation formula:
Here, is the required time,
is the original time,
is the velocity of the spacecraft and
is the velocity of light.
Since , so
.
So the time required will be large.
Answer:
Explanation:
The frequency of a sodium vapor lamp,
We need to find the wavelength of light. The relation between wavelength, frequency and speed of light is given by :
So, the wavelength of light is equal to .