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# If then

Hint:

### To find the value of angle A we will solve the equation using the cosine formula .

## The correct answer is:

### In ABC,

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Light wave enters from medium 1 to medium 2. Its velocity in 2^{nd} medium is double from 1^{st}. For total internal reflection the angle of incidence must be greater than

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### If the function f(x) dt → 5 as |x| → I, then the value of ‘a’ so that the equation 2x + f(t) dt = a has at least two roots of opposite signs in (-1, 1) is

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### In

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### On Bohr’s stationary orbits -

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### Arrange the following particles in increasing order of values of e/m ratio: Electron (e), proton (p), neutron (n) and α-particle (α) -

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### In

### In

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An antenna behaves as resonant circuit only when its length is

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### If

### If

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### In the adjoining diagram, a wavefront *AB*, moving in air is incident on a plane glass surface *XY*. Its position *CD* after refraction through a glass slab is shown also along with the normals drawn at *A* and *D*. The refractive index of glass with respect to air () will be equal to

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### Which statement is not correct for n=5,m=2:

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