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Electromagnetic Wave

155754 Which of the following has minimum wavelength ?

1 X-rays

2 Ultraviolet rays

3

γ

-rays

4 Cosmic rays

Explanation:

D Cosmic rays have smallest wavelength $(10^{-}$ $^{14} m - 10^{- 12} m)$ while gamma rays $(10^{- 12} m - 10^{- 10})$ is second smallest wavelength.

AIPMT- 2002

Electromagnetic Wave

155755 The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively. Then,

1 a

>

b

>

c

2 a

<

b

<

c

3

a = b = c

4 a

>

c

>

b

Explanation:

A The wavelength of y-rays is the shortest and the wavelength of ultraviolet rays is the longest, the frequency of y-rays is the highest and the frequency of ultraviolet rays is the lowest.
The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively then $a > b > c$ .

AIPMT- 2000

Electromagnetic Wave

155756 Ozone layer blocks the radiations of wave length

1 less than

3 \times 10^{- 7} m

2 equal to

3 \times 10^{- 7} m

3 more than

3 \times 10^{- 7} m

4 All of the above

Explanation:

A The ozone layer acts as a barrier to protect the planet from the sun's damaging radiation of high frequency. The ozone layer typically absorbs radiation with a wavelength less than $9 \times 10^{- 7}$ or around $3 \times 10^{- 1}$ $^{7} m$ while ozone layer blocks the radiation of wavelength less than $3 \times 10^{- 7} m$ .

AIPMT- 1999

Electromagnetic Wave

155757 A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of

1 sky wave

2 ground wave

3 sea wave

4 Both (a) and (b)

AIPMT- 1993

Electromagnetic Wave

155754 Which of the following has minimum wavelength ?

1 X-rays

2 Ultraviolet rays

3

γ

-rays

4 Cosmic rays

Explanation:

D Cosmic rays have smallest wavelength $(10^{-}$ $^{14} m - 10^{- 12} m)$ while gamma rays $(10^{- 12} m - 10^{- 10})$ is second smallest wavelength.

AIPMT- 2002

Electromagnetic Wave

155755 The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively. Then,

1 a

>

b

>

c

2 a

<

b

<

c

3

a = b = c

4 a

>

c

>

b

Explanation:

A The wavelength of y-rays is the shortest and the wavelength of ultraviolet rays is the longest, the frequency of y-rays is the highest and the frequency of ultraviolet rays is the lowest.
The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively then $a > b > c$ .

AIPMT- 2000

Electromagnetic Wave

155756 Ozone layer blocks the radiations of wave length

1 less than

3 \times 10^{- 7} m

2 equal to

3 \times 10^{- 7} m

3 more than

3 \times 10^{- 7} m

4 All of the above

Explanation:

A The ozone layer acts as a barrier to protect the planet from the sun's damaging radiation of high frequency. The ozone layer typically absorbs radiation with a wavelength less than $9 \times 10^{- 7}$ or around $3 \times 10^{- 1}$ $^{7} m$ while ozone layer blocks the radiation of wavelength less than $3 \times 10^{- 7} m$ .

AIPMT- 1999

Electromagnetic Wave

155757 A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of

1 sky wave

2 ground wave

3 sea wave

4 Both (a) and (b)

AIPMT- 1993

Electromagnetic Wave

155754 Which of the following has minimum wavelength ?

1 X-rays

2 Ultraviolet rays

3

γ

-rays

4 Cosmic rays

Explanation:

D Cosmic rays have smallest wavelength $(10^{-}$ $^{14} m - 10^{- 12} m)$ while gamma rays $(10^{- 12} m - 10^{- 10})$ is second smallest wavelength.

AIPMT- 2002

Electromagnetic Wave

155755 The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively. Then,

1 a

>

b

>

c

2 a

<

b

<

c

3

a = b = c

4 a

>

c

>

b

Explanation:

A The wavelength of y-rays is the shortest and the wavelength of ultraviolet rays is the longest, the frequency of y-rays is the highest and the frequency of ultraviolet rays is the lowest.
The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively then $a > b > c$ .

AIPMT- 2000

Electromagnetic Wave

155756 Ozone layer blocks the radiations of wave length

1 less than

3 \times 10^{- 7} m

2 equal to

3 \times 10^{- 7} m

3 more than

3 \times 10^{- 7} m

4 All of the above

Explanation:

A The ozone layer acts as a barrier to protect the planet from the sun's damaging radiation of high frequency. The ozone layer typically absorbs radiation with a wavelength less than $9 \times 10^{- 7}$ or around $3 \times 10^{- 1}$ $^{7} m$ while ozone layer blocks the radiation of wavelength less than $3 \times 10^{- 7} m$ .

AIPMT- 1999

Electromagnetic Wave

155757 A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of

1 sky wave

2 ground wave

3 sea wave

4 Both (a) and (b)

AIPMT- 1993

Electromagnetic Wave

155754 Which of the following has minimum wavelength ?

1 X-rays

2 Ultraviolet rays

3

γ

-rays

4 Cosmic rays

Explanation:

D Cosmic rays have smallest wavelength $(10^{-}$ $^{14} m - 10^{- 12} m)$ while gamma rays $(10^{- 12} m - 10^{- 10})$ is second smallest wavelength.

AIPMT- 2002

Electromagnetic Wave

155755 The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively. Then,

1 a

>

b

>

c

2 a

<

b

<

c

3

a = b = c

4 a

>

c

>

b

Explanation:

A The wavelength of y-rays is the shortest and the wavelength of ultraviolet rays is the longest, the frequency of y-rays is the highest and the frequency of ultraviolet rays is the lowest.
The frequency of $γ$ -rays, $X$ -rays and ultraviolet rays are $a, b$ and $c$ respectively then $a > b > c$ .

AIPMT- 2000

Electromagnetic Wave

155756 Ozone layer blocks the radiations of wave length

1 less than

3 \times 10^{- 7} m

2 equal to

3 \times 10^{- 7} m

3 more than

3 \times 10^{- 7} m

4 All of the above

Explanation:

A The ozone layer acts as a barrier to protect the planet from the sun's damaging radiation of high frequency. The ozone layer typically absorbs radiation with a wavelength less than $9 \times 10^{- 7}$ or around $3 \times 10^{- 1}$ $^{7} m$ while ozone layer blocks the radiation of wavelength less than $3 \times 10^{- 7} m$ .

AIPMT- 1999

Electromagnetic Wave

155757 A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of

1 sky wave

2 ground wave

3 sea wave

4 Both (a) and (b)

AIPMT- 1993