JEE Advanced 2017 Paper 2 Offline | Dual Nature of Radiation Question 7 | Physics

JEE Advanced 2017 Paper 2 Offline

MCQ (Single Correct Answer)

-0.75

A photoelectric material having work-function $${\phi _0}$$ is illuminated with light of wavelength $$\lambda \left( {\lambda < {{he} \over {{\phi _0}}}} \right).$$ The fastest photoelectron has a de-Broglic wavelength $${\lambda _d}.$$ A change in wavelength of the incident light by $$\Delta \lambda $$ result in a change $$\Delta {\lambda _d}$$ in $${\lambda _d}.$$ Then the ratio $$\Delta {\lambda _d}/\Delta \lambda $$ is proportional to

$${\lambda _d}/\lambda $$

$$\lambda _d^2/{\lambda ^2}$$

$$\lambda _d^3/\lambda $$

$$\lambda _d^3/{\lambda ^2}$$

JEE Advanced 2016 Paper 1 Offline

MCQ (Single Correct Answer)

-1

In a historical experiment to determine Planck's constant, a metal surface was irradiated with light of different wavelengths. The emitted photoelectron energies were measured by applying a stopping potential. The relevant data for the wavelength ($$\lambda $$) of incident light and the corresponding stopping potential (V₀) are given below:

$$\lambda \left( {\mu m} \right)$$	V₀(Volt)
0.3	2.0
0.4	1.0
0.5	0.4

Given that c = 3 $$ \times $$ 10⁸ ms^-1 and e = 1.6 $$ \times $$ 10^-19 C, Planck's constant (in units of J-s) found from such an experiment is) :

6.0 $$ \times $$ 10^-34

6.6 $$ \times $$ 10^-34

6.4 $$ \times $$ 10^-34

6.8 $$ \times $$ 10^-34

JEE Advanced 2014 Paper 2 Offline

MCQ (Single Correct Answer)

-1

A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are u₁ and u₂, respectively. If the ratio u₁ : u₂ = 2 : 1 and hc = 1240 eV nm, the work function of the metal is nearly

3.7 eV

3.2 eV

2.8 eV

2.5 eV

IIT-JEE 2009 Paper 2 Offline

MCQ (Single Correct Answer)

-1

Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions $$\phi_p=2.0~\mathrm{eV}$$, $$\phi_q=2.5~\mathrm{eV}$$ and $$\phi_r=3.0~\mathrm{eV}$$, respecticely. A light beam containing wavelengths of 550 nm, 450 nm and 350 nm with equal intensities illuminates each of the plates. The correct I-V graph for the experiment is (Take hc = 1240 eV nm)

IIT-JEE 2009 Paper 2 Offline Physics - Dual Nature of Radiation Question 5 English Option 1

IIT-JEE 2009 Paper 2 Offline Physics - Dual Nature of Radiation Question 5 English Option 2

IIT-JEE 2009 Paper 2 Offline Physics - Dual Nature of Radiation Question 5 English Option 3

IIT-JEE 2009 Paper 2 Offline Physics - Dual Nature of Radiation Question 5 English Option 4

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