1
JEE Main 2020 (Online) 5th September Morning Slot
Numerical
+4
-0
A beam of electrons of energy E scatters from a target having atomic spacing of 1 $$\mathop A\limits^o$$. The first maximum intensity occurs at $$\theta$$ = 60o. Then E (in eV) is ______.
(Planck constant h = 6.64 × 10–34 Js,
1 eV = 1.6 × 10–19 J, electron
mass m = 9.1 × 10–31 kg)
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2
JEE Main 2020 (Online) 5th September Morning Slot
Numerical
+4
-0
A compound microscope consists of an objective lens of focal length 1 cm and an eyepiece of focal length 5 cm with a separation of 10 cm.
The distance between an object and the objective lens, at which the strain on the eye is minimum is $${n \over {40}}$$ cm. The value of n is _____.
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3
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
Orange light of wavelength 6000 $$\times$$ 10–10 m illuminates a single
slit of width 0.6 $$\times$$ 10–4 m. The maximum possible number of diffraction minima produced on both sides of the central maximum is ___________.
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4
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
The distance between an object and a screen is 100 cm. A lens can produce real image of the object on the screen for two different positions between the screen and the object. The distance between these two positions is 40 cm. If the power of the lens is close to $$\left( {{N \over {100}}} \right)D$$ where N is an integer, the value of N is _________.
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