1
JEE Main 2023 (Online) 11th April Morning Shift
Numerical
+4
-1

A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit radiation of six different wavelengths. The frequency of incident light is $$x \times 10^{15} \mathrm{~Hz}$$. The value of $$x$$ is ____________.

(Given h $$=4.25 \times 10^{-15} ~\mathrm{eVs}$$ )

2
JEE Main 2022 (Online) 26th June Evening Shift
Numerical
+4
-1

The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 6630 $$\mathop A\limits^o$$ is 0.42 V. If the threshold frequency is x $$\times$$ 1013 /s, where x is _________ (nearest integer).

(Given, speed light = 3 $$\times$$ 108 m/s, Planck's constant = 6.63 $$\times$$ 10$$-$$34 Js)

3
JEE Main 2022 (Online) 24th June Morning Shift
Numerical
+4
-1

When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is v1. When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes v2. If v2 = x v1, the value of x will be __________.

4
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
+4
-1
A particle of mass 9.1 $$\times$$ 10$$-$$31 kg travels in a medium with a speed of 106 m/s and a photon of a radiation of linear momentum 10$$-$$27 kg m/s travels in vacuum. The wavelength of photon is __________ times the wavelength of the particle.