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ololo11 [35]
3 years ago
6

A train is travelling at 15 m/s. It accelerates at 3 m/s² for 20 seconds. How far does the train travel in this time?

Physics
1 answer:
Ymorist [56]3 years ago
8 0

Answer:

its going  to be 30 m/s

Explanation:

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About 0.1 eV is required to break a "hydrogen bond" in a protein molecule. Calculate the minimum frequency and maximum wavelengt
Verdich [7]

Answer:

2.41\cdot 10^{13}Hz, 1.24\cdot 10^{-5}m

Explanation:

The energy of the photon must be equal to 0.1 eV, so let's convert this value into Joules first:

E=0.1 eV \cdot 1.6\cdot 10^{-19} J=1.6\cdot 10^{-20}J

The energy of the photon is related to its frequency by

E=hf

where h is the Planck constant and f is the frequency. Substituting,

f=\frac{E}{h}=\frac{1.6\cdot 10^{-20}J}{6.63\cdot 10^{-34}Js}=2.41\cdot 10^{13}Hz

And now we can find the wavelength of the photon, which is given by

\lambda=\frac{c}{f}

where c is the speed of light. Substituting,

\lambda=\frac{3\cdot 10^8 m/s}{2.41\cdot 10^{13} Hz}=1.24\cdot 10^{-5}m

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\huge\tt{{\gray{ANSWER:}}}

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