Question

$\huge\mathfrak\pink{Thank \: you\: sis...}$

Come to the main point guys

1. A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

2. List sources of noise pollution in your surroundings.

3. Explain in what way
noise pollution is harmful to human.

​

Answer 1

$\huge \star \green {Answer}$

(I) Frequency is defined as the number of oscillations per unit time. Time = 4 sec. Time Period = (4/40) = 0.1 sec. Frequency = (Number of Oscillations)/ (Time taken)Frequency = (40/4) =10Hz.

(ii). List sources of noise pollution in your surroundings.

• sound of vehicles

• Bursting of Crackers.

• Loudspeakers at High Volume.

• Kitchen Appliances (like Hand Mixer)

• Electronic Appliances (like TV)

• Barking of dogs.

(iii) Noise pollution impacts millions of people on a daily basis. The most common health problem it causes is Noise Induced Hearing Loss (NIHL). Exposure to loud noise can also cause high blood pressure, heart disease, sleep disturbances, and stress. These health problems can affect all age groups, especially children.

Answer 2

Answer:

The premolars, also called premolar teeth, or bicuspids, are transitional teeth located between the canine and molar teeth. In humans, there are two premolars per quadrant in the permanent set of teeth, making eight premolars total in the mouth. They have at least two cusps.

Explanation:

congratulation my sis you are also gen.ius