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Novay_Z [31]
3 years ago
10

A rocket takes off from Earth. It travels 825km in 75 seconds. What is the

Physics
1 answer:
Naya [18.7K]3 years ago
4 0

Answer:

11 km/s

Explanation:

v=s/t

v=825km/75s

v=11km/s

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a sample contains 100 g of radioactive isotope. How much radioactive isotope will remain in the sample after 1 half-life?
kap26 [50]

Answer:

\huge\boxed{50g}

Definition:

Half-life- The time taken for half of the radioactive isotopes to decay.

Explanation:

How does radioactive decay work? Radioactive decay is a process by which unstable nuclei become more stable through the emission of alpha or beta particles or gamma rays.

Since a half-life is the time taken for half of the isotopes to decay, we can simply divide the initial mass of 100 grams by 2; this gives us 50 grams.

1) Divide 100g by 2.

\frac{100g}{2}=50g

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Answer:

Explanation:

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Higher frequency rays have the highest energies.

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The frequency of gamma rays is more than 10^19 cycles per second and wavelength less than 100 picometers.

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