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Reflection of Sound

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Question

While performing an experiment on verifying the laws of reflection of sound,the length of the tubes used in the 'set-up' are preferably taken to be about
a) 2 cm b) 5 cm c) 50 cm d) 200 cm

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Solution

50 cm.

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Q. While performing an experiment on verifying the laws of reflection of sound, the 'reflected sound' can be detected better by keeping one ear :
(1) near the end of the tube and keeping the other ear closed
(2) near the end of the tube and keeping the other ear open
(3) at about 5 cm from the end of the tube and keeping the other ear closed
(4) at about 5 cm from the end of the tube and keeping the other ear open

Q. For verifying the laws of reflection of sound, a student has to choose from :
(i) a black polished metal sheet or a white thermocol sheet.
(ii) a 0.5 m long tube of diameter 3 cm or a 1.5 m long tube of diameter 20 cm
He should prefer to choose the :
(1) metal sheet and the 0.5 m long tube
(2) metal sheet and the 1.5 m long tube
(3) thermocol sheet and the 0.5 m long tube
(4) thermocol sheet and the 1.5 m long tube

Q. While performing an experiment on verifying the laws of reflection of sound, a student is to choose between
(i) a narrow or a wide tube, and
(ii) a strong or a faint source of the sound.
The observed experimental difference, between the values of angle of incidence and angle of reflection, is likely to be minimum when he chooses a :
(1) narrow tube and a faint source
(2) wide tube and a faint source
(3) narrow tube and a strong source
(4) wide tube and a strong source

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm

(b) A concave lens of focal length 50 cm

(c) A convex lens of focal length 5 cm

(d) A concave lens of focal length 5 cm

Q. Question 6
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens of focal length 50 cm
(b) A concave lens of focal length 50 cm
(c) A convex lens of focal length 5 cm
(d) A concave lens of focal length 5 cm

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