1
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
Which of the following statements is false ?
A
Photon has momentum as well as wavelength.
B
Splitting of spectral lines in electrical field is called Stark effect.
C
Rydberg constant has unit of energy.
D
Frequency of emitted radiation from a black body goes from a lower wavelength to higher wavelength as the temperature increases.
2
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is :
A
0.529 $$\mathop {\rm A}\limits^ \circ$$
B
2$$\pi$$ $$\times$$ 0.529 $$\mathop {\rm A}\limits^ \circ$$
C
$${{0.529} \over {2\pi }}$$ $$\mathop {\rm A}\limits^ \circ$$
D
4 $$\times$$ 0.529 $$\mathop {\rm A}\limits^ \circ$$
3
JEE Main 2018 (Online) 15th April Morning Slot
+4
-1
Ejection of the photoelectron from metal in the photoelectric experiment can be stopped by applying 0.5 V when the radiation of 250 nm is used. The work function of the metal is :
A
4 eV
B
4.5 eV
C
5 eV
D
5.5 eV
4
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
The electron in the hydrogen atom undergoes transition from higher orbitals to orbital of radius 211.6 pm. This transition is associated with :
A
Lyman series
B
Balmer series
C
Paschen series
D
Brackett series
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Physics
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Modern Physics
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