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3 years ago

7

What is Minimum Threshold Frequency?

2 answers:

tatiyna3 years ago

8 0

Answer:

The threshold frequency is defined as the minimum frequency of incident radiation below which the photoelectric emission is not possible completely.

Lady bird [3.3K]3 years ago

4 0

the minimum frequency of radiation that will produce a photoelectric effect.

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What do scientists use to determine the temperature of a star?

Nastasia [14]

Answer:

Measure the brightness of a star through two filters and compare the ratio of red to blue light. Compare to the spectra of computer models of stellar spectra of different temperature and develop an accurate color-temperature relation.

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3 years ago

Consider Compton Scattering with visible light.A photon with wavelength 500nm scatters backward(theta=180degree) from a free ele

JulijaS [17]

Answer: $4.86(10)^{-12}m$

Explanation:

The Compton Shift $\Delta \lambda$ in wavelength when photons are scattered is given by the following equation:

$\Delta \lambda=\lambda' - \lambda_{o}=\lambda_{c}(1-cos\theta)$ (1)

Where:

$\lambda'=500 nm=500(10)^{-9} m$ is the wavelength of the scattered photon

$\lambda_{o}$ is the wavelength of the incident photon

$\lambda_{c}=2.43(10)^{-12} m$ is a constant whose value is given by $\frac{h}{m_{e}.c}$ , being $h=4.136(10)^{-15}eV.s$ the Planck constant, $m_{e}$ the mass of the electron and $c=3(10)^{8}m/s$ the speed of light in vacuum.

$\theta=180\°$ the angle between incident phhoton and the scatered photon.

$\Delta \lambda=2.43(10)^{-12} m (1-cos(180\°))$ (2)

$\Delta \lambda=4.86(10)^{-12}m$ (3) This is the shift in wavelength

5 0

2 years ago

A ball thrown straight upwards with an initial velocity of 15 m/s. Calculate how long the ball will remain in the air and the ma

GenaCL600 [577]

Answer:

The ball remain in air for 3.06 seconds.

Maximum height reached = 22.94 m

Explanation:

We have equation of motion v = u + at

At maximum height, final velocity, v =0 m/s

Initial velocity = 15 m/s

acceleration = -9.81 m/s²

Substituting

0 = 15 -9.81 t

t = 1.53 s

Time of flight = 2 x 1.53 = 3.06 s

The ball remain in air for 3.06 seconds.

We also have equation of motion v² = u² + 2as

At maximum height, final velocity, v =0 m/s

Initial velocity = 15 m/s

acceleration = -9.81 m/s²

Substituting

0² = 15² - 2 x 9.81 x s

s = 22.94 m

Maximum height reached = 22.94 m

3 0

3 years ago

The root word bio means life if you know that biotic means having life what can you guess is one of the meanings of the prefix a

Goryan [66]

Answer:

active

Explanation:

"alive"

5 0

3 years ago

A bored college student on top of a 6-story tall building drops a water balloon on his friends directly below. In one second it

eduard

Answer:

c Four stories below the top.

Explanation:

t = Time taken

u = Initial velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s² = a

$s=ut+\dfrac{1}{2}at^2\\\Rightarrow s_1=0\times t+\dfrac{1}{2}\times g\times 1^2\\\Rightarrow s_1=0.5g\ m$

In two seconds

$s_2=0\times t+\dfrac{1}{2}\times g\times 2^2\\\Rightarrow s_2=4\times 0.5g\\\Rightarrow s_2=4s_1$

So, in two seconds the water balloon will fall 4 stories below the top

4 0

2 years ago