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4 years ago

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Which missing item would complete this alpha decay reaction ? ________—> 228/88Ra + 4/2He A.224/96 Rn B. 232/90 Th C. 230/92

U D. 235/92 U

1 answer:

neonofarm [45]4 years ago

6 0

A.224/96 Rn I think i'm right if i'm wrong i'm srry

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Which of the following statements about energy is false?

Artemon [7]

Answer:

c

Explanation:

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3 years ago

Which is less likely to be a reliable source of information, the webpage of a university or the webpage of a scientist who is tr

tatyana61 [14]

webpage of a scientist who is trying to sell a new invention

trying to dell = vested interest.

umiversity should be objective impartial

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3 years ago

A physicist drives through a stop light. When he is pulled over, he tells the police officer that the Doppler shift made the red

Alik [6]

Answer:

Speed of physicist car is 0.036c or 1.08 x 10⁷ m/s .

Explanation:

Doppler Effect is defined as the change in frequency or wavelength of the wave as the source or/and observer moving away or towards each other.

In this case, the Doppler effect equation in terms of wavelength is :

$\lambda_{s} = \lambda_{o}\sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } }$ ......(1)

Here $\lambda_{s}$ is source wavelength, $\lambda_{o}$ is observed wavelength, v is speed of the observer and c is the speed of light.

Given :

Source wavelength, $\lambda_{s}$ = 660 nm = 660 x 10⁻⁹ m

Observed wavelength, $\lambda_{0}$ = 555 nm = 555 x 10⁻⁹ m

Substitute these values in the equation (1).

$555\times10^{-9} } = 660\times10^{-9} \sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } }$

$\sqrt{\frac{1-\frac{v}{c} }{1+\frac{v}{c} } } = 0.84$

${\frac{1-\frac{v}{c} }{1+\frac{v}{c} } } = (0.84)^{2} = 0.7056$

$1-\frac{v}{c}=0.7056+0.7056\frac{v}{c}$

$\frac{v}{c}=\frac{0.2944}{8.056}$

$v = 0.036c=0.036\times3\times10^{8}$

v = 1.08 x 10⁷ m/s

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3 years ago

Physical system

ch4aika [34]

Answer:

this happens because there is gravitational force acting upon it.

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3 years ago

Read 2 more answers

If a train going 60 m/s hits the breaks, and it takes the train 85 seconds to stop, what is the train´s acceleration

Flauer [41]

Acceleration is change in velocity over time --> $a = \frac{Δv}{t}$

Δv or change in velocity equals the Final velocity minus the initial velocity

Our initial velocity here is 60m/s while our final velocity is 0 m/s

The time interval is 85 seconds so...

$a = \frac{0-60}{85}$

$a = \frac{-60}{85}$

$a = -0.706$

The negative is there to indicate that the train in slowing down or decelerating

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4 years ago