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3 years ago

What is the geologic time scale and how is it used

Physics

1 answer:

olganol [36]3 years ago

6 0

Answer:

It is a type of map used to map out the geographical change over time. I believe

Explanation:

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3 years ago

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A physicist is calibrating a spectrometer that uses a diffraction grating to separate light in order of increasing wavelength (λ

cluponka [151]

Answer:

Explanation:

Given

$N=3680 cm^{-1}$

therefore slit spacing $d=\frac{1}{N}=\frac{1}{3680}=2.717\times 10^{-4}\ cm$

since $d\sin \theta =n\lambda$

for $n=1$

$d\sin \theta =\lambda$

Now,at $\theta _1=12.9^{\circ},\Rightarrow \lambda _1=6.0657\times 10^{-7}\ m=606.57\ nm$

at $\theta _2=14.2^{\circ}\Rightarrow \lambda_2=666.5\ nm$

at $\theta _3=15^{\circ}\Rightarrow \lambda_3=703.21\ nm$

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3 years ago

Which statement describes the use of control rods?

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Control rods are rods, plates, or tubes containing a neutron absorbing material (material with high absorbtion cross-section for thermal neutron) such as boron, hafnium, cadmium, etc., used to control the power of a nuclear reactor.
so the statement that describe a control rod is:
Control rods are lowered into the reactor to slow down the reaction by absorbing neutrons.

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4 years ago

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If a barometer reads 772 mm hg, what is the atmospheric pressure expressed in pounds per square inch?

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A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast (what speed) were they running

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Answer: