Answer:
<u><em>3.721 m/s</em></u>
This is the explanation of the ans
The green bars are called "error bars." They indicate the range of uncertainty that scientists have about the data on the graph.
(Note: Not all error bars are shown.)
Why do you think these error bars are smaller near the year 2000 than in the 1890s?
Why do you think these error bars are smaller near the year 2000 than in the 1890s?
2 answers:
You might be interested in
Answer:
145 m
Explanation:
Given:
Wavelength (λ) = 2.9 m
we know,
c = f × λ
where,
c = speed of light ; 3.0 x 10⁸ m/s
f = frequency
thus,
substituting the values in the equation we get,
f = 1.03 x 10⁸Hz
Now,
The time period (T) =
or
T = = 9.6 x 10⁻⁹ seconds
thus,
the time interval of one pulse = 100T = 9.6 x 10⁻⁷ s
Time between pulses = (100T×10) = 9.6 x 10⁻⁶ s
Now,
For radar to detect the object the pulse must hit the object and come back to the detector.
Hence, the shortest distance will be half the distance travelled by the pulse back and forth.
Distance = speed × time = 3 x 10^8 m/s × 9.6 x 10⁻⁷ s) = 290 m {Back and forth}
Thus, the minimum distance to target = = 145 m