3 years ago

Describe the radioactive disintegration’s known as alpha, beta, and gamma decay

Physics

1 answer:

I am Lyosha [343]3 years ago

5 0

What’s the question

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We get hurt when we kick a brick however we can displace it easily without pain when it is pushed gently, why?

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You’re using more force to kick the brick than to push it gently.

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3 years ago

A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.38 ns for the light to travel through 32.0 cm of an unkno

Vera_Pavlovna [14]

Answer:

Wavelength = 489.52 nm

Explanation:

Given that the wavelength of the light = 633 nm

The time taken by the light in unknown liquid = 1.38 ns

Also,

1 ns = 10⁻⁹ s

So, t = 1.38 × 10⁻⁹ s

Also,

Distance = 32.0 cm = 0.32 m ( 1 cm = 0.01 m)

So, speed of the light in the liquid = Distance / Time = 0.32 / 1.38 × 10⁻⁹ m/s = 2.32 × 10⁸ m/s

Frequency of the light does not change when light travels from one medium to another. So,

$\frac {V_{air}}{\lambda_{air}}=\frac {V_{liquid}}{\lambda_{liquid}}$

${V_{air}}=3\times 10^8\ m/s$

${\lambda_{air}}=633\ nm$

${V_{liquid}}=2.32\times 10^8\ m/s$

${\lambda_{liquid}}=?\ nm$

So,

$\frac {3\times 10^8\ m/s}{633\ nm}=\frac {2.32\times 10^8\ m/s}{\lambda_{liquid}}$

Wavelength = 489.52 nm

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3 years ago

When a low-mass star runs out of helium to fuse into carbon, what will it do?

Andrei [34K]

A false dalse true true false and thats a;ll i know

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3 years ago

Human populations all over the world burn fossil fuels to power cars, planes, and generate electricity. Select the statement tha

Eddi Din [679]

A.) Burning fossil fuels pollutes the environment and our heavy reliance on them creates a long-term problem because they are not a renewable resource.

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4 years ago

Read 2 more answers

A 3.0 g bullet traveling at a speed of 400 m/s enters a tree and exits the other side with a speed of 200 m/s. Where did the bul

cricket20 [7]

Answer:

1800J

Explanation:

Step one:

given data

mass of bullet m= 3g= 0.03kg

initial velocity u = 400m/s

final velocity v= 200 m/s

Step two:

1.The bullet's lost kinetic energy went inside the tree.

2. The energy transferred is computed as

= initial KE- KE final

Initial KE= 1/2mu^2

Initial KE= 1/2*0.03*400^2

Initial KE= 1/2*0.03*160000

Initial KE= 1/2*4800

Initial KE= 2400J

KE final= 1/2mv^2

KE final= 1/2*0.03*200^2

KE final= 1/2*0.03*40000

KE final= 1/2*1200

KE final= 600J

KE transferred = 2400-600

KE transferred= 1800J

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3 years ago