某声音的声压为0.05Pa,则其声压级为()。A:63dBB:65dBC:68dBD:70dB

作者: rantiku 人气: - 评论: 0
问题 某声音的声压为0.05Pa,则其声压级为()。
选项 A:63dB B:65dB C:68dB D:70dB
答案 C
解析 已知某噪声声压的情况下,声压级的计算公式为:Lp20lgp/p0(dB)(空气中的参考声压p0规定为2*10-5Pa),将题中数据代入该式,则该声音的声压级为Lp=20lg[0.05/(2*10-5)]≈68(dB)。

猜你喜欢

发表评论
更多 网友评论0 条评论)
暂无评论
错误啦!

错误信息

  • 消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
  • 文件: /twcms/kongphp/cache/cache_redis.class.php
  • 位置: 第 85 行
    <?php echo 'KongPHP, Road to Jane.'; ?>