If the frequency of an E.M. wave is 10 MHz, then its wavelength is:
1.  30 m
2.  300 m
3.  3 m
4.  none of the above

Subtopic:  Properties of EM Waves |
 75%
From NCERT
AIPMT - 1999
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The frequency order for \(\gamma\) - rays (\(b\)), X – rays (\(a\)), and UV – rays (\(c\)) is:

1. \( b>a>c \) 2. \( a>b>c \)
3. \( c>b>a \) 4. \( a>c>b\)
Subtopic:  Electromagnetic Spectrum |
 80%
From NCERT
AIPMT - 2000
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The biological importance of the ozone layer is:

1. it stops ultraviolet rays.
2. ozone layer reduces the greenhouse effect.
3. ozone layer reflects radio waves.
4. ozone layer controls \(\mathrm{O}_2 / \mathrm{H}_2\) ratio in the atmosphere.


 

Subtopic:  Electromagnetic Spectrum |
 85%
From NCERT
AIPMT - 2001
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Which of the following has the minimum wavelength?
1. X-rays
2. Ultraviolet rays
3. γ-rays
4. Cosmic rays

Subtopic:  Electromagnetic Spectrum |
From NCERT
AIPMT - 2002
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What is the cause of “Greenhouse effect”?

1. Infra-red rays

2. Ultraviolet rays

3. X-rays

4. Radio waves

Subtopic:  Electromagnetic Spectrum |
 62%
From NCERT
AIPMT - 2002
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The velocity of electromagnetic waves is parallel to:

1. B×E

2. E×B

3. E

4. B

Subtopic:  Properties of EM Waves |
 89%
From NCERT
AIPMT - 2002
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If \(\lambda_{\mathrm{v}}, \lambda_{\mathrm{x}},\) and\(\lambda_\mathrm{m}\) represent the wavelengths of visible light, x-rays and microwaves respectively, then:
1. \( \lambda_{\mathrm{m}}>\lambda_{\mathrm{x}}>\lambda_{\mathrm{v}} \)
2. \( \lambda_\mathrm{v}>\lambda_\mathrm{m}>\lambda_\mathrm{x } \)
3. \( \lambda_\mathrm{v}>\lambda_\mathrm{x}>\lambda_\mathrm{m }\)
4. \(\lambda_{\mathrm{m}}>\lambda_{\mathrm{v}}>\lambda_{\mathrm{x}}\)

Subtopic:  Electromagnetic Spectrum |
 86%
From NCERT
AIPMT - 2005
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