JEE Main 2014 (Online) 11th April Morning Slot | Electromagnetic Waves Question 3 | Physics

JEE Main 2014 (Online) 11th April Morning Slot

MCQ (Single Correct Answer)

-1

Match the List - I (Phenomenon associated with electromagnetic radiation) with List - II (Part of electromagnetic spectrum) and select the correct code from the choices given the lists :

List - I		List - II
(I)	Doublet of sodium	(A)	Visible radiation
(II)	Wavelength corresponding to temperature associated with the isotropic radiation filling all space	(B)	Microwave
(III	Wavelength emitted by atomic hydrogen in interstellar space	(C)	Short radiowave
(IV)	Wavelength of radiation arising from two close energy levels in hydrogen	(D)	X - rays

(I)-(A), (II)-(B), (III)-(B), (IV)-(C)

(I)-(A), (II)-(B), (III)-(C), (IV)-(C)

(I)-(D), (II)-(C), (III)-(A), (IV)-(B)

(I)-(B), (II)-(A), (III)-(D), (IV)-(A)

JEE Main 2014 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

-1

A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100 W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly :

1.34 V/m

2.68 V/m

4.02 V/m

5.36 V/m

JEE Main 2014 (Online) 19th April Morning Slot

MCQ (Single Correct Answer)

-1

If microwaves, X rays, infracted, gamma rays, ultra-violet, radio waves and visible parts of the electromagnetic spectrum by M, X, I, G, U, R and V, the following is the arrangement in ascending order of wavelength :

R, M, I, V, U, X and G

M, R, V, X, U, G and I

G, X, U, V, I, M and R

I, M, R, U, V, X and G

JEE Main 2015 (Online) 10th April Morning Slot

MCQ (Single Correct Answer)

-1

An electromagnetic wave travelling in the x-direction has frequency of 23 $$ \times $$ 10¹⁴ Hz and electric field amplitude of 27 Vm^$$-$$1. From the options given below, which one describes the magnetic field for this wave ?

$$\overrightarrow B $$ (x, t) = (3 $$ \times $$ 10^$$-$$8T) $$\widehat j$$

sin [ 2$$\pi $$ (1.5 $$ \times $$ 10^$$-$$8x $$-$$ 2 $$ \times $$ 10¹⁴t)]

$$\overrightarrow B $$ (x, t) = (9 $$ \times $$ 10^$$-$$8T) $$\widehat k$$

sin [ 2$$\pi $$ (1.5 $$ \times $$ 10^$$-$$6x $$-$$ 2 $$ \times $$ 10¹⁴t)]

$$\overrightarrow B $$ (x, t) = (9 $$ \times $$ 10^$$-$$8T) $$\widehat i$$

sin [ 2$$\pi $$ (1.5 $$ \times $$ 10^$$-$$8x $$-$$ 2 $$ \times $$ 10¹⁴t)]

$$\overrightarrow B $$ (x, t) = (9 $$ \times $$ 10^$$-$$8T) $$\widehat j$$

sin [(1.5 $$ \times $$ 10^$$-$$6 x $$-$$ 2 $$ \times $$ 10¹⁴t)]

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