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What do you mean by convex and concave lens. What are their different types?

asked Oct 18, 2017 in Physics by sonia (36.5k points)

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1 answer 155 views

What is the effect of medium on the speed of sound.

asked Oct 16, 2017 in Physics by shamroz (41.5k points)

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What precautions should be kept in mind, while determining the time period of a simple pendulum?

asked Oct 16, 2017 in Physics by shamroz (41.5k points)

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The breathing becomes rapid and deep after exercise. Why?

asked Oct 16, 2017 in English by shamroz (41.5k points)

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1 answer 105 views

Why ultrasound is useful in medical field.

asked Oct 17, 2017 in Physics by sonia (36.5k points)

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1 answer 145 views

What is meant by echo? Can we explain how does this happen?

asked Oct 17, 2017 in Physics by shamroz (41.5k points)

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Suppose you and your friend are on the moon. Can you be able to hear any sound produced by your friend?

asked Oct 17, 2017 in Physics by sonia (36.5k points)

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Describe how light is refracted through lenses?

asked Oct 18, 2017 in Physics by sonia (36.5k points)

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1 answer 147 views

Do the magnitude of angle of incidence and angle of refraction equal?

asked Oct 16, 2017 in Physics by shamroz (41.5k points)

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1 answer 97 views

State the conditions for total internal reflection.

asked Oct 18, 2017 in Physics by shamroz (41.5k points)

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1 answer 138 views

Why are sound waves called mechanical waves?

asked Oct 17, 2017 in Physics by sonia (36.5k points)

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1 answer 94 views

How does a convex tens or converging tens forms a virtual image of a real object?

asked Oct 18, 2017 in Physics by sonia (36.5k points)

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1 answer 93 views

Define mirror formula. Also write its equation.

asked Oct 18, 2017 in Physics by shamroz (41.5k points)

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Explain image formation with ray diagram when the object is placed beyond 2F from a convex lens?

asked Oct 18, 2017 in Physics by sonia (36.5k points)

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1 answer 54 views

What are the adopted rules about the sign conventions for the lenses?

asked Oct 18, 2017 in Physics by sonia (36.5k points)

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1 answer 89 views

What do you mean regular and irregular reflection of light?

asked Oct 17, 2017 in Physics by shamroz (41.5k points)

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Water is amphoteric specie according to Bronsted-Lowry concept. What is its nature according to Lewis concept?

asked Sep 16, 2017 in Chemistry by shamroz (41.5k points)

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1 answer 87 views

Define the following terms:

asked Oct 17, 2017 in Physics by shamroz (41.5k points)

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Show that motion of a simple pendulum is SHM.

asked Oct 16, 2017 in Physics by shamroz (41.5k points)

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We can recognize persons speaking with the same loudness from their voice. How is this possible?

asked Oct 17, 2017 in Physics by sonia (36.5k points)

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