QBManager

PHXI15:WAVES

358787 Which colour of the light has the longest wavelength?

1 Red

2 Blue

3 Green

4 Violet

NEET - 2019

PHXI15:WAVES

358788 Which of the following rays is emmitted by a human body?

1 Visible light

2

U V

rays

3

X

-rays

4

I R

rays

Explanation:

Temperature of the body is $37^{\circ} C$ and it emits heat radiation which falls in $I R$ and microwave region.

PHXI15:WAVES

358789 Which of the following statement does not hold good for thermal radiation?

1 The wavelength changes when it travels from one medium to another.

2 The frequency changes when it travels from one medium to another.

3 The speed changes when it travels from one medium to antother.

4 They travel in straight line in a given medium

KCET - 2009

PHXI15:WAVES

358790 One requires $11 e V$ of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in

1 Infrared region

2 Visible region

3 Microwave region

4 Ultraviolet region

Explanation:

Given, energy required to dissociate a carbon monoxide molecule into carbon and oxygen atoms.
$E = 11 e V$
We know that, $E = h υ$ , where
$h = 6.62 \times 10^{- 34} J - s; υ = f r e q u e n c y$
$\Rightarrow 11 e υ = h υ$
$\Rightarrow υ = \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{h} J$
$E = h υ$
$= \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{6 \cdot 62 \times 10^{- 34}} J = 2.65 \times 10^{15} H z$
This frequency belongs to ultraviolet region.

NCERT Exempler

PHXI15:WAVES

358787 Which colour of the light has the longest wavelength?

1 Red

2 Blue

3 Green

4 Violet

NEET - 2019

PHXI15:WAVES

358788 Which of the following rays is emmitted by a human body?

1 Visible light

2

U V

rays

3

X

-rays

4

I R

rays

Explanation:

Temperature of the body is $37^{\circ} C$ and it emits heat radiation which falls in $I R$ and microwave region.

PHXI15:WAVES

358789 Which of the following statement does not hold good for thermal radiation?

1 The wavelength changes when it travels from one medium to another.

2 The frequency changes when it travels from one medium to another.

3 The speed changes when it travels from one medium to antother.

4 They travel in straight line in a given medium

KCET - 2009

PHXI15:WAVES

358790 One requires $11 e V$ of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in

1 Infrared region

2 Visible region

3 Microwave region

4 Ultraviolet region

Explanation:

Given, energy required to dissociate a carbon monoxide molecule into carbon and oxygen atoms.
$E = 11 e V$
We know that, $E = h υ$ , where
$h = 6.62 \times 10^{- 34} J - s; υ = f r e q u e n c y$
$\Rightarrow 11 e υ = h υ$
$\Rightarrow υ = \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{h} J$
$E = h υ$
$= \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{6 \cdot 62 \times 10^{- 34}} J = 2.65 \times 10^{15} H z$
This frequency belongs to ultraviolet region.

NCERT Exempler

PHXI15:WAVES

358787 Which colour of the light has the longest wavelength?

1 Red

2 Blue

3 Green

4 Violet

NEET - 2019

PHXI15:WAVES

358788 Which of the following rays is emmitted by a human body?

1 Visible light

2

U V

rays

3

X

-rays

4

I R

rays

Explanation:

Temperature of the body is $37^{\circ} C$ and it emits heat radiation which falls in $I R$ and microwave region.

PHXI15:WAVES

358789 Which of the following statement does not hold good for thermal radiation?

1 The wavelength changes when it travels from one medium to another.

2 The frequency changes when it travels from one medium to another.

3 The speed changes when it travels from one medium to antother.

4 They travel in straight line in a given medium

KCET - 2009

PHXI15:WAVES

358790 One requires $11 e V$ of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in

1 Infrared region

2 Visible region

3 Microwave region

4 Ultraviolet region

Explanation:

Given, energy required to dissociate a carbon monoxide molecule into carbon and oxygen atoms.
$E = 11 e V$
We know that, $E = h υ$ , where
$h = 6.62 \times 10^{- 34} J - s; υ = f r e q u e n c y$
$\Rightarrow 11 e υ = h υ$
$\Rightarrow υ = \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{h} J$
$E = h υ$
$= \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{6 \cdot 62 \times 10^{- 34}} J = 2.65 \times 10^{15} H z$
This frequency belongs to ultraviolet region.

NCERT Exempler

PHXI15:WAVES

358787 Which colour of the light has the longest wavelength?

1 Red

2 Blue

3 Green

4 Violet

NEET - 2019

PHXI15:WAVES

358788 Which of the following rays is emmitted by a human body?

1 Visible light

2

U V

rays

3

X

-rays

4

I R

rays

Explanation:

Temperature of the body is $37^{\circ} C$ and it emits heat radiation which falls in $I R$ and microwave region.

PHXI15:WAVES

358789 Which of the following statement does not hold good for thermal radiation?

1 The wavelength changes when it travels from one medium to another.

2 The frequency changes when it travels from one medium to another.

3 The speed changes when it travels from one medium to antother.

4 They travel in straight line in a given medium

KCET - 2009

PHXI15:WAVES

358790 One requires $11 e V$ of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in

1 Infrared region

2 Visible region

3 Microwave region

4 Ultraviolet region

Explanation:

Given, energy required to dissociate a carbon monoxide molecule into carbon and oxygen atoms.
$E = 11 e V$
We know that, $E = h υ$ , where
$h = 6.62 \times 10^{- 34} J - s; υ = f r e q u e n c y$
$\Rightarrow 11 e υ = h υ$
$\Rightarrow υ = \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{h} J$
$E = h υ$
$= \frac{11 \times 1 \cdot 6 \times 10^{- 19}}{6 \cdot 62 \times 10^{- 34}} J = 2.65 \times 10^{15} H z$
This frequency belongs to ultraviolet region.

NCERT Exempler

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