1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong ?
A
Ultraviolet rays
B
$$\gamma - rays$$
C
X-rays
D
Infra-red rays
2
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = Velocity of light)
A
$${{2E} \over {{C^2}}}$$
B
$${E \over {{C^2}}}$$
C
$${E \over C}$$
D
$${{2E} \over C}$$
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Light with an energy flux of 25 $$ \times $$ 104 W m$$-$$2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is
A
1.25 $$ \times $$ 10$$-$$6 N
B
2.50 $$ \times $$ 10$$-$$6 N
C
1.20 $$ \times $$ 10$$-$$6 N
D
3.0 $$ \times $$ 10$$-$$6 N
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
An electromagnetic wave of frequency $$\upsilon = 3.0$$ MHz passes from vaccum into a dielectric medium with relative permittivity $${{\varepsilon _r}}$$ = 4.0. Then
A
Wavelength is doubled and frequency becomes half.
B
Wavelength is halved and frequency remains unchanged.
C
Wavelength and frequency both remain unchanged.
D
Wavelength is doubled and frequency unchanged.
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