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3 years ago

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Choose the statement(s) that is/are true about Bohr model of the atom. (i) Electron energies are quantized and they can assume o

nly certain discrete energy values. (ii) An electron receiving extra energy could transfer to a higher energy level. (iii) An electron falling from a high energy level to a low energy level will radiate the excess energy in the form of electromagnetic radiation. (iv) An electron can be stripped off an atom by giving it sufficient energy.

1 answer:

GuDViN [60]3 years ago

6 0

Answer:

All of the statements are correct corresponding to Bohr's model of atom.

Explanation:

The postulates of Bohr's model of atom are:

1) Electron's revolve around nucleus in stationary states with constant energy levels.

2) The angular momentum of the electrons is quantised.

3) Electron's can change their stationary states by either absorbing energy if it moves to a state of higher energy or emitting radiations if it moves to a lower stationary state from higher state.

4) While revolving in an orbit an electron does not change it's energy.

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Answer:

Part a)

$H = 44.1 m$

Part b)

$y = 13.48 m$

Part c)

$d = 8.86 m$

Explanation:

Part a)

As we know that ball will reach at maximum height at

t = 3 s

now we will have

$t = \frac{v sin\theta}{g}$

now we have

$3 = \frac{vsin\theta}{9.8}$

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Now maximum height above ground is given as

$H = \frac{v^2sin^2\theta}{2g}$

$H = \frac{29.4^2}{2(9.8)}$

$H = 44.1 m$

Part b)

Height of the fence is given as

$y = (vsin\theta) t - \frac{1}{2}gt^2$

$y = (29.4)(5.5) - \frac{1}{2}(9.8)(5.5^2)$

$y = 13.48 m$

Part c)

As we know that its horizontal distance moved by the ball in 5.5 s is given as

$x = v_x t$

$97.5 = v_x (5.5)$

$v_x = 17.72 m/s$

now total time of flight is given as

$T = 3 + 3 = 6 s$

so range is given as

$R = v_x T$

$R = (17.72)(6)$

$R = 106.4 m$

so the distance from the fence is given as

$d = 106.4 - 97.5$

$d = 8.86 m$

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Answer:

It can be seen from the operation of pin-hole camera, formation of shadows and eclipse.

Explanation:

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One this evidence can be seen from the operation of pin-hole camera, which depends on rectilinear propagation of light

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