If the frequency of an EM 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 |
 76%
From NCERT
AIPMT - 1999
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The frequency order for \(\gamma\text-\)rays (\(b\)), \(X\text-\)rays (\(a\)), and \(UV\text-\)rays (\(c\)) is:
1. \( b>a>c \) 2. \( a>b>c \)
3. \( c>b>a \) 4. \( a>c>b\)
Subtopic:  Electromagnetic Spectrum |
 81%
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. \(X\text-\)rays
2. Ultraviolet rays
3. \(\gamma\text-\)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. \(X\text-\)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 |
 90%
From NCERT
AIPMT - 2002
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If \(\lambda_{v}, \lambda_{x},\) and \(\lambda_{m}\) represent the wavelengths of visible light, \(x\text-\)rays and microwaves respectively, then:
1. \( \lambda_{m}>\lambda_{x}>\lambda_{v} \)
2. \( \lambda_{v}>\lambda_{m}>\lambda_{x } \)
3. \( \lambda_{v}>\lambda_{x}>\lambda_{m }\)
4. \(\lambda_{m}>\lambda_{v}>\lambda_{x}\)

Subtopic:  Electromagnetic Spectrum |
 87%
From NCERT
AIPMT - 2005
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